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英语人教版第四单元语法

发布时间:2021-02-05 15:24:01

❶ 初二英语上册第四单元语法、重点

1.If 引导的条件状语从句,because 引导的原因状语从句和because of 引导的原因状语。
2. 条件状语从句里,回要注意if后的句子多用答一般现在时,而主句多用将来时。
3because引导的原因状语从句有时候侯可以和because of + 词组进行转换。
如: He was late because It rained heavily.
换成He was late because of the heavy rain.

❷ 人教版九年级英语第四单元语法、词组、重点句子

课课通上应该有的

❸ 初三上册英语第四单元语法总结

Unit 4
一、知识点
1、①give sb sth=give sth to sb
类似的词还有:pass、lend、show、write、send等
②buy sb sth=buy sth for sb
类似的词还有:make、draw、cook等
2、hundred 、thousand、mi11ion与数字连用不能用复数。
hundreds of、thousands of、mi11ions of中必须用复数。
3What if …… 如果……将会怎么样?(引导条件状语从句、疑问句)
eg What if she doesn’t come? 她要是不来怎么办?
What if your parent don’t agree? 如果你的父母不同意怎么办?
What if you should fall sick? 如果你生病了怎么办?
7、before 引导一个句子,为连词。后跟短语或名词等,则为介词。
8、food 表示食品种类,一种食物时,为可数名词
What does/do ×× look like? 问相貌。
She is tall.
What’s ×× like? 问“品质性格”。
She is outgoing.
12、 give a speech 做演讲 have a speech听演讲 give a report 做报告have a report 听报告
13、permission (n.) 允许,许可 permit (v.) 允许
Don’t read others’ diary without permission.
14、plenty of 充足的,相当多的。修饰可数或不可数名词,只能用于肯定句。否定、疑问句中用 enough.
15、not……in the slightest=not……at all 根本不
16、company ①公司 ②一群人,一伙人
③ 陪伴
I would like your company if you are free tonight.
17、get along (with)=get on (with)
①进行,进展
eg The business is getting along very well. 生意进展的很顺利。
How are you getting along with your English study? 你的英语学习进展的怎么样了?
②相处
eg Do you get along with your boss?= Do you and your boss get along? 你跟老板合得来吗?
I’m getting along very well with my classmates. 我和同学们相处得很好。
18、would rather … than … (= would … rather than)宁愿,而不愿。
前后连接两个动词原形,否定形式为:would rather not do sth
①would rather … than … = prefer … to …
但prefer … to … 若连接两个动词,动词应为v-ing 形式。
eg He would rather jog than play football.=He prefers jogging to playing football.
②would rather 常单独使用,表示“宁愿做…”
eg He would rather watch TV at home.
③rather than = instead of 而不是
连接两个并列成分,前后对称。
eg I’d prefer to go to in summer rather than in winter.
I decided to write rather than telephone.
I like going out with you rather than with him.
She enjoys listening rather than speaking.
19、today、here、there、downstairs、upstairs、above、below做宾语修饰名词,放在名词之后
eg the weather today今天的天气 people here这里的人们the man downstairs楼下的那个男的
the passage below 下面的这段话
22、the rest 其余的,可指代可数或不可数名词。The other(s) 只能指代可数名词
23、come up with 提出或提出(答案、方法)等。类似于think of.
eg How would you come up with this idea? 你怎样想出这个注意的?
My brother is a person who often comes up with good idea.我弟弟是个常常能想出好点子的人
24、offer 提供 offer sb sth 给××…… offer to sb sth 主动提出干……

二、短语
1、give it to charity 把它捐给慈善机构 2、medical research 医学研究
3、What if …… 如果…怎么样? 4、get nervous 紧张
5、take a big exam 参加大考 6、help with 有助于
7、in public 在公共场合 8、hardly ever 几乎不
9、the whole school 全校 10、without permission 为经许可
11、be(make) friends with 与…交朋友 12、ask one’s permission 请求××的允许
13、introce…to… 把…介绍给… 14、invite…to do… 邀请…干…
15、social situations 社会环境 16、not… in the slightest 根本不,一点也不 17、right away 立刻,马上 18、all day 全天
19、be friendly to 对…友好 20、at lunch time 在午饭时间
21、a bit shy 有点害羞 22、English speech contest 英语演讲比赛
23、represent the class 代表班级 24、come top 名列第一(前茅)
25、let … down 使…失望 26、come up with 提出、想出
27、be sure of + n./pron. 28、the rest of the students 其余的学生
be sure to do 相信… 29、have a lot of experience (in) doing sth
be sure +that 从句 在做某事方面有经验
30、deal with 对付,处理 31、come out 出版
32、give advice on… 在…方面提出意见、建议 33、by accident 偶然地,无意之中
34、hurry to do sth 匆匆忙忙干… 35、an internet friend 网友

三、句子
1、He doesn’t know if he should bring a present. 他不知道是否该带礼物。
2、You shouldn’t worry about what other people say.你不应该考虑别人说什么。
3、What will you do if you had a million dollars? 如果你有一百万美元,你会干什么?
4、If I were you, I ‘d take a small present.如果我是你,我会带一个小礼物。
5、I’m too tired to do well.我太累了,没考好。
6、Dogs can be a lot of trouble.狗会带来很多麻烦。
7、What are you like? 你是什么样的人?
8、I’d invite him/her to have dinner at my house.我会邀请他(她)到我家吃饭。
9、You enjoy the company of other people.你喜欢别人的陪伴。
10、I feel nervous talking in front of many people.我在众人面前讲话时感到紧张。
11、She always comes top in the school exams.她在学校的考试中总是名列前茅。
12、She doesn’t want to let her friends down.她不愿让朋友失望。
13、If I were you, I’ll get out of here.如果我是你,我会离开这里。

祝你学习进步,更上一层楼!(*^__^*)

❹ 人教版八年级英语上册第四单元语法!!急!!要各个单词的用法!!

火眼金睛:

1.“花销”细盘点:
spend,take,cost和pay的用法:
初中阶段关于“花钱”,“花费时间”的词常见的有以下五个:buy,cost,pay(for),spend和take。很多学生对这几个词的词义和用法似懂非懂,用起来往往出错。其实这些词都与钱物有关,与时间有关的只有take和spend。下面具体谈一谈其用法:①spend指花钱,花费时间。主语是人。其常见结构分别为to spend money on sth.,spend time(in)doing sth.。
I spent six yuan on a new dictionary.
—How do you spend your spare time?
—I spend my spare time writing books.②take指花钱(=cost)
It takes/costs me a lot of money to buy a big house.
= To buy a big house takes/costs me a lot of money.
take用来说明做某事需要多少时间,有三种不同的结构:
1)主语是人
She took the whole day to read the novel.(她花了一整天那本小说。)
2)主语是某种活动
The journey took me half an hour.
Reading the novel took her the whole day.
3)用形式主语it
It took me half an hour to get home yesterday.
It takes much time to do the shopping.
③pay(for),pay表示付给人家钱、帐单等;pay for表示买东西付款,也表示替别人付钱。主语是人。其常见结构是to pay sb.some money,pay money for sth.
You must pay me 100yuan a week for your meals.
How much did you pay for that book? ④cost指花钱,表示价值或代价(此代价可以是时间)。主语是事或物或动词不定式短语。
其常见结构是to cost sb.some money。
The dictionary cost me 6yuan.
【小试牛刀】翻译:(1)我六十元钱买了一本词典 (五种译法)
(2)读这本书花了我一整天的时间 (四种译法)
(Keys:
(1)a.I bought the dictionary for 60 yuan.
b.The dictionary cost me 60 yuan.
c.I paid 60 yuan for the dictionary.
d.I spent 60yuan on the dictionary.
e.It took me60 yuan to buy the dictionary.
(2)a.I spent the whole day reading the book.
b.I took the whole day to read the book.
c.Reading the book took me the whole day.
d.It took me the whole day to read the book.)

2.“数目”要说清:

a number of…“许多”与the number of…“……的数字/数目”这两个词组的用法要分清:
①a number of…意思是“一些,若干”(= some),后接可数名词复数或代词,谓语动词用复数形式。
a number of…词组中还可以加入形容词表示数量大或小等(例如:a large/small number of…许多/少数……)。
②the number of…意思是“……的数字/数目”,介词of同其后名词构成介词短语,修饰the number.当它作主语时,谓语动词用单数。例如: Many people took part in 10,000-metre race, but only a number of them kept on running to the end. 许多人参加了10000米跑,但只有一些人坚持跑到底。
A number of my friends think I should take a holiday.
我的一些朋友认为我应该休假。
The number of students is about forty.学生人数大约是40人左右。

3.到达路线有几条:
arrive in/at,get to;reach意为“抵达,到达”,我们在句子中要正确运用。
【辨析】 arrive vi.到达什么地方,后接in或at,大的地方用in,小的地方用at;reach vt.后接地点名词;get to也可表示“到达”,后接地点名词,比以上两词更口语化,也可用get加副词(home,here,there等)。
题例:When did you __________ home?
A. go to B.arrive at C.reach in D.reach
【解析】 在英语中“到达”可表达为get to,arrive in/at和reach。get和ararrive是不及物动词,所以后面接宾语时,应借助于介词。而reach是及物动词,它后面可以直接跟宾语。但是本题的home是副词,副词前不可以有介词,所以此题的正确答案是D。

【拓展】arrive一词除了表示“到达”外还有“来到”、“出生”的意思:
Good weather is arriving.好天气就要来了。
My baby arrived last night.我的宝宝是昨天夜里出生的。
Too swift(快的) arrives as tardy(迟缓的) as too slow.
[谚语]欲速则不达。

4.条条大路通罗马:(All Roads Lead to Rome)

英语中表示交通方式的形式很多,但总的来说,不外乎两种方式,即: 用介词和动词来表示。
(一) 用介词表示。
(1) by + 表示交通工具的名词,泛指“乘/坐某种交通工具”,其中名词前无任何修饰语,且只能用单数。如:
He came by train, but his wife came by bus.
他坐火车来的,但他妻子坐汽车来的。
Travelling by elephant is great fun. 骑象旅行很有趣。
类似的词组还有:by car乘车;by plane乘飞机;by ship乘船;by taxi乘计程车;等。
(2) in/on + 表示交通工具的名词 , 或泛指或特指“乘/坐某种交通工具”,其中名词前常有冠词、物主代词、指示代词或名词所有格等修饰语,名词可以是单数或复数。
① bus,train,boat,plane,ship等有厢,有舱的名词前,用介词in或on。如:
We are going there in/on a bus.我们将乘公共汽车去那里。(泛指)
Don't come here on /in the ship.不要坐船来这里。(特指)
② bike或motorbike前,只能用介词on。如:
They go to work on their bikes.他们骑自行车上班。(特指)
She went out on her new motorbike.
她骑着她的新摩托车出去了。(特指)
③ car,taxi前,多用介词in。如:
We are going to France in John’s car.
我们将坐约翰的车去法国。(特指)
(3) by/on + 表示交通工具的名词,特指“乘/坐某一趟/辆/艘(车,船等)”,其中名词为单数,其前常有定冠词与数词或具体时刻一起作修饰语。如: They came here by/on the first bus.他们是坐头班车来的。
You can get there by/on the Number 10 bus / bus No.10.
你可以乘10路公共汽车到那里。
He went up to London by/on the 10:30 (train).
他是乘10时30分的火车去伦敦的。
(4) by + 表示交通工具的名词,泛指“乘/坐某种档次的交通工具旅行”,其中名词为单数,其前常有表示“等级或档次”的形容词作修饰语。如:
She travels by third-class train. 她乘三等车旅行。
I will go to Beijing by the fast train. 我将乘快车去北京。
He flew to Paris by first class (plane). 他坐头等舱飞往巴黎。
He went to Tokyo by a large ship.他乘一艘大船去了东京。
(5) by + 表示交通线路或交通线路所经范围的名词 ,表示“经由陆路/水路/空中等线路旅行或运输”,其中名词为单数或不可数,其前无任何修饰语。如:
Shall we go by land or by sea ? 我们是由陆路去还是由水路去?
It saves a lot of time to travel by air.
乘飞机旅行可以节省许多时间。
类似的词组还有:by water由水路;by road由公路;by rail由铁路;等。
(6) on + 表示人或动物特定身体部位的名词,表示“步行或骑马/骆驼”,其中名词只能是foot、horseback或 camelback,其前无任何修饰语。如:
She usually goes to school on foot. 她通常步行上学。
Our friends arrived on horseback.我们的朋友是骑马到的。
(7) on + 表示交通工具的动物名词,表示“骑驴/马/象/骆驼”,其中名词为donkey、horse、elephant或camel,其前常有不定冠词a/an。如:
The old man used to go out on a donkey.
那个老汉以前都是骑驴外出的。
He went there on a horse. 他骑马去了那里。
类似的词组还有:on an elephant骑象;on a camel骑骆驼。
二、 用动词表示。
(1)“动词 + to + 地点名词”或“动词 + 地点副词”。 这种动词主要是walk (步行),ride(骑车),drive(开车),fly(乘飞机),sail(乘船)等。如:
I usually walk to school. 我通常步行上学。
We sometimes ride to school. 我们有时骑车上学。
They drove to the station. 他们开车去了车站。
Jack flew there last Sunday. 杰克上星期乘飞机去那里了。
(2) “take a/the + 表示交通工具的名词”,表示“乘/坐……”。如:
Will you take a bus to go there?你乘汽车去那儿吗?
I took a taxi to the hospital. 我坐出租车到医院去了。
类似的表达还有:take a ship(乘轮船),take a plane(乘飞机)等。
(3) “ride a/an + bike,motorbike或表示交通工具的动物名词,表示“骑……”。如:
I ride a bike to work every day. 我天天骑自行车上班。
He came here riding a horse /an elephant. 他骑马/象来到了这里。
(4) “ride on/in + a/an + 表示交通工具的名词”,表示“乘/坐/骑……”。如:
The boy liked to ride on a motorbike.那男孩喜欢骑摩托车。
类似的表达还有:ride in/on a ship/train/plane/boat等。
【辨析】ride a bike着重动作;ride in/on a bike着重状态。
(5) “have/take a ride in/on + 表示交通工具的名词”,表示“乘/坐/骑一下/次……”。如:
Would you like to have/take a ride in my new car ?
你要不要坐坐我的新车?
He let me have/take a ride on his camel.
他让我骑了一下他的骆驼。
(6) “go for a ride in/on + 表示交通工具的名词”,表示“乘/坐/骑……去兜风”。如:
They went for a ride on their horses/bicycles.
他们骑马/自行车去兜了一圈。
I went for a ride on my horse before breakfast.
早餐前我骑马出去遛了遛。

巩固练习:
I:用by,in,on,take填空。
1.—How do you go to school every day?
—____ bike.
2.They will go to the cinema ____ bus.
3.He went to the park ____ a car yesterday.
4.Helen will go there ____ the 12:00 bus.
5.Will you ____ the bus to Beijing tomorrow?
II:就划线部分提问。
1.Mr Green goes to the post office by bike.(对划线部分提问)
2.Ann is going shopping on foot.(对划线部分提问)
(Keys:I: 1.By 2.by 3.in 4.on /by 5.Take
II: 1. How does Mr Green go to the post office?
2. How is Ann going shopping ? )

5.否定也“温柔”:
“not all”是一个部分否定,可见否定也“温柔”。例如:In North America,not all students take the bus to school. (在北美,并非所有的学生都乘车上学。)
英语中的部分否定(即不完全否定)有如下一些表示方法:
一 )all 的否定式:not all…(或:all…not)表示"并非都……"、"不是所有的都……" 例如: Not all bamboo grows tall. 并非所有的竹子都会长很高。
二)both 的否定式:not…both (或:both… not) "并非两个……都……" 例如:
I don't want both the books. 我不是两本书都要。
Both (the) windows are not open. 两扇窗子并不都开着。
三) every…的否定式: "不是每……都……" 例如:
Not everyone likes this book. 并非人人都喜欢这本书。
This flower is not seen everywhere. 这花并不是随处可见的。
四) always的否定式: "并非总是(并非一直)……" 例如:
He is not always so sad. 他并不是一直都这样悲伤。
五) all the time 的否定式: "并非一直……"、"未必老是……" 例如:
A foolish man doesn't make a mistake all the time.
笨人未必老是犯错误。
六) not…and…的否定式,被否定的往往是and后面的那一部分。 例如:
He did not speak clearly and correctly. 他讲得清楚但不正确。
She cannot sing and dance. 她会唱歌但不会跳舞。
如果将and 换成or,not 对其后面的两部分就全盘否定了。
He did not speak clearly or correctly. 他讲的既不清楚也不正确。

【注意】 如要对上述的all, both, every, always, 以及entirely, altogether, completely, quite 和 all the time 等词作完全否定,那就分别要用与之相对应的全否定词,如no, none, neither, no one, never, not (never)… at all 等。例如:
All of them can do it.--- None of them can do it.
Both are good.---Neither is good.
Everybody likes it. ---Nobody likes it.
He is always late. --- He is never late.
We don't trust them entirely. --- We never trust them at all.
He was here all the time. --- He was never here.

6.风云“聚”义厅:
本单元重点句子释义集锦:
1. How do you get to school? I walk to school.你是怎样到校的?我步行。

翻译:你们如何去上海?我乘飞机去,他坐火车去。

2. How about the white shirt? 这件白衬衫怎么样?

翻译:去游泳怎么样?

3.I usually walk but sometimes I take the bus.
我通常步行,但有时坐公共汽车。

翻译:他总是骑自行车上学,但这次他乘地铁上学了。

4.How long does it take you to get to school?
It takes about 10 minutes to walk and 15 minutes by bus.
你需要多长时间到校?步行大约10分钟,乘汽车15分钟。

翻译:建造这座桥工人们将花费1年多的时间。

5. How far is it from his home to school? About 10 kilometers.

从他家到学校有多远?大约10公里。

翻译:从地球到月球有多远?大约38万公里远。

6.Lin Fei’s home is about 10 kilometers from school.
林飞的家离学校大约10公里

翻译:我们学校到东湖公园大约7公里。

7. He leaves for school at around six-thirty.
他大约在6点30分动身去学校。

翻译:我们下星期去北京。

8. Then the early bus takes him to school.然后,他乘坐早班车到学校。

翻译:请把书带到学校来。

9.Thomas wants to know where Nina lives.托马斯想要知道尼娜住在哪里。

翻译:我想知道她认为交通怎么样。

10. In Japan, most students take trains to school, although others also walk or ride their bikes.
在日本,大部分学生乘坐火车上学,尽管其他人也步行或骑自行车。

翻译:他虽然有病,仍坚持学习。________________________________________

11. A small number of students take the subway to school.

小部分学生乘坐地铁上学

翻译:我有许多信件要写。

12.What do you think of the transportation in your town?

你对你们镇的交通认为怎么样?

翻译:你认为这本书怎么样?

13. She is dead but her memory still lives on.
她虽然死了,但人们仍然怀念她。

翻译:羊靠青草维持生命。

(Keys:
1.How are you going to Shanghai? I am going by plane,he′s going by train.
2.How about going swimming?
3.He usually ride a bike to school, but this time he takes the subway.
4.It took the workers over one year to build the bridge.
5.How far is it from the earth to the moon? About 380,000 kilometers.
6.Our school is about 7 kilometers from Donghu Park.

7.We are leaving/(leaves )for Beijing next week.
8.Please bring the books to school.
9.I want to know what she think of /(how she likes)the transportation.
10. He kept studying although he was ill.
11.I have a number of/(many/a lot of/lots of) letters to write.
12.What do you think of this book?
13.Sheep live on the grass.)

语法聚焦:
How引起的特殊疑问句
How引起的特殊疑问句可用来询问各种情况。例如:
(1) How are your parents?你父母好吗? Very well, thank you. 很好,谢谢
(2) How do your spell the word? 这个词怎么拼?
(3) How do you like the film? 这电影你觉得怎么样?
=What do you think of…?(你认为……怎么样?)
(4) How do you usually go to school? 你通常怎么上学?
I usually go by bike. 我通常骑自行车上学的。
(5)How is the weather today?=What is the weather like today?
今天天气如何?
How构成的疑问句短语: how many多少(指可数的量) how much多少(不可数名词,也可以问价格)how often(问频率) how soon(问将来时间,多久)howl ong (问时间或物体长度) how far多远 how old多大年 龄

❺ 新目标八年级上册英语第四单元语法

Unit 4 How do you get to school?
重点语法:询问别人做某事的方式
用 How 引导特殊疑问句
其回答有内多种方式,其中一种结构是容 by doing sth. 或 by sth. 的结构。
询问两地的距离用 how far 引导特殊疑问句
回答用 be + (distance) + [away] + from 的结构。
例句:A: How do you get to school?(你如何去上学?)
B: I take the subway.(我乘地铁去上学。)

OK?希望能帮到你啊!

❻ 八年级上册英语第四单元语法聚焦翻译

articularly does this observation apply to those who have lost sight and hearing in alt

❼ 人教版新目标初二英语上第四单元的语法要点

far+from depend+onmust+V原ill为表语形容词近义词sickso mucha number of相当于many 许多的意思a small number of一少部分a large number of 一大部分the number of ....的数量around the word=all over the word全世界重点语句1.can I help you?2.how far is it from here?3.how long does it take?4.thank you very much 5.you are welcome6.how do you get to school重点语法1.by+交通工具名词2.by+交通路线位置3.in+交通工具名词4.on+限定词+交通工具名词5.take a、the+交通工具名词6.ride+限定词+交通工具名词7.fly+to表示乘飞机;飞往8.表示步行去某地可用go to+某地+on foot,也可用walk to+某地9.not all译为不都相当于all..not...10.leave for意为动身去...11.leave..for...意为离开去...12.It takes +一段时间+to do sth以为做某事花费某人多长时间

❽ 高中英语人教版必修四第四单元Reading的相关语法

Book 4 Mole 4
1. bring up
2. as a result of…
3. be known for
4. earn/make one’s/a living
5. come to power
6. make a breakthrough=break through
7. a quantity of…+单数谓语,
quantities of…+复数谓语
8. a physical change,
9. physical labour, physical disability
10. escape punishment=escape being punished
11. escape from
12. the key to (doing) sth
13. rise/increase by…
14. rise/increase to…
15. do…by accident
16. throw… into…
17. jump out of…
18. a leading figure
19. as a child
20. from an early age
21. experiment with…
22. export…to…
23. send astronauts into space
24. be at war with…
25. shoot arrows
26. attach…to…,be attached to…,
27. in…direction
28. introce… to…
29. keep…doing
30. be used for…
31. graate from…
32. in the area/field of
33. award…Noble Prize for physics
34. in/ring the 1990s/1990’s
35. In the rice-growing world, the Chinese scientist, Yuan Longping, is a leading figure.
36. He thought that the key to feeding people was to have more rice and to proce it more quickly.
37. He thought there was only one way to do this—by crossing different species of rice plant.
38. Researchers were brought in from all over China to develop the new system.
39. As a result of Yuan Longping’s discoveries Chinese rice proction rose by 47.5 percent in the 1990s.
40. 50 thousand square kilometers of rice fields were converted to growing vegetables and other cash crops.
41. In Pakistan rice is the second most important crop after wheat and will be grown in many parts of the country.
42. Today rockets are very advanced machines which we can use to send astronauts into space.
43. The Chinese had a form of gunpowder which was put in bamboo tubes and thrown into fires to make explosions ring festivals.
44. The Chinese discovered that the gas escaping from the tube could lift it into the air.
45. The tubes were attached to a long stick which help keep the rocket moving in a straight direction.
46. One Italian scientist even invented a rocket which could travel over the surface of water and hit an enemy ship.
47. Not everyone wanted to use rockets in battles.
48. Did Wan Hu die in the explosion? Or was he carried miles into space, becoming the world’s first astronaut?

Book 4 Mole 4
1. 抚养养育,呕吐提出问题,抬高
2. 由于的结果
3. 因为而著名
4. 谋生
5. 掌权
6. 突破
7. 大量的

8. 一个物理变化
9. 体力劳动,身体残疾
10. 逃脱惩罚
11. 从中逃脱
12. 做的关键
13. 增加了
14. 增加到
15. 偶然做某事
16. 把仍入
17. 从中跳出
18. 一个领衔人物
19. 当他是一个孩子时
20. 养育
21. 从很小时起
22. 用……做实验
23. 出口……到……
24. 把飞行员送入太空
25. 与….处于交战状态
26. 射箭
27. 系…到…上,被系到…上,
28. 朝…方向
29. 把…引入,引进到…
30. 被用做…
31. 从毕业
32. 在领域
33. 授予诺贝尔物理奖
34. 在20世纪90年代
35. 在水稻种植界, 中国科学家袁隆平堪称为是一个领军人物 / 杰出人物。

36. 他认为, 解决人们吃饭问题的关键在于拥有更多的稻米, 并且能更快地生产出来。

37. 他认为只有一种方法可以做到这一点—对不同种类的水稻进行杂交。

38. 全国各地的研究人员被召集到一起, 共同研究这项新体系。
39. 由于袁隆平的发现,中国的水稻产量在20世纪90年代增长了47.5%。

40. 五万平方千米的稻田转而种起了蔬菜及其它经济作物。

41. 在巴基斯坦, 水稻是继小麦之后的第二大作物, 而且将在这个国家的许多地区种植。

42. 当今, 火箭是非常先进的器械, 我们可以用来向太空派送宇航员。

43. 中国人发明了一种火药, 它可以在节日期间被装进竹筒扔进火里发出(噼里啪啦的)爆炸声。

44. 中国人发现, 从竹筒里跑出来的空气可以把它推向空中。

45. 竹筒被系在一根长棍子上, 它利于保持火箭直向飞行。

46. 一位意大利科学家甚至发明了一种能够在水面上飞行并击中敌舰的火箭。

47. 但是并非每个人都想在战争中运用火箭。

48. 万胡在爆炸中死掉了? 还是被带往空中几英里的地方, 成为世界上第一位宇航员?

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