中小学教育资源及组卷应用平台
Unit 7 The unknown world
Grammar 语法学习—原因状语从句
A 原因状语从句
在句中表示原因、理由的从句叫原因状语从句。
1 引导原因状语从句的从属连词主要有because, since, as。
2 表示语气的强弱顺序是：because﹥since﹥as。
3 这些连词都不能和so连用。
4 当原因状语从句放于句首时，通常要用逗号与主句隔开。
引导词because
1 because强调明确直接的因果关系，回答“why”问题
2 because从句可与for互换，但for是并列连词，连接的是并列句，并且在for前必须有逗号隔开。如：
引导词since
1 since表示明摆着的理由或原因，常译为“既然”
2 since还可引导时间状语从句，表示“自从……以来”
引导词as
1 as语气最弱，表示附带说明的原因
2 as还可引导时间状语从句，表示“当……的时候”、“随着……”。如：
B because与 because of的区别
because和because of的意思都是“因为；由于”。 但because 是连词，其后接句子。because of 是复合介词，其后接名词、代词、动名词、what 从句等。
语法练习
1、 单项选择。
1.We didn’t enjoy the day ______ the weather was so bad.
A. because B. though C. unless D. till
【答案】A
【解析】句意：我们不喜欢这一天，____天气太坏了。前后因果关系。故选A
2 The baby is sleeping, _______ you’d better keep quiet.
A. but B. or C. because D. so
【答案】D
【解析】句意：孩子在睡觉，你最好保持安静。前后句子因果关系。这里表示结果故选D
3 They were late for the meeting ______ the heavy rain.
A. because of B. because C. since D. as
【答案】A
【解析】句意：因为大雨，他们开会迟到了。the heavy rain. 是短语。故用A
4. It rained last night, _______ the ground is wet.
A. or B. for C. but D. though
【答案】B
【解析】句意：昨晚下雨了，因为地上是湿的。For表示解释的原因。
5.She won’t go to the cinema ______ she has already seen the film.
A. until B. if C. so D. because
【答案】D
【解析】句意：她不会去看电影的，_____她已经看过这部电影了。前后句子因果关系。故选D
6 ______ you’re tired, you’d better stay at home and have a rest.
A. Since B. Or C. Though D. Till
【答案】A
【解析】句意：既然你累了，你最好呆在家里休息一下。since ，从句表示明显的或已为人所知的理由，常译为“因为；既然”
7. — Why didn’t you go to the party — ______ I wasn’t invited.
A. As B. Since C. Because D. So
【答案】C
【解析】回答why的句子只能用because。because 表示直接原因，着重点在从句，它所指的原因通常是听话人所不知道的，语气最强。常用来回答why 的提问
8. — Did you call Jack back
— I didn’t need to ______ I’ll see him tomorrow.
A. though B. because C. unless D. when
【答案】B
【解析】句意：-你给杰克回电话了吗？ -我不需要，因为我明天见他。
9. ______ we have no money, we can’t buy it.
A. Until B. Unless C. As D. Although
【答案】C
【解析】as 引导的原因状语从句语气最弱，它所表示的原因只是对结果的附加说明，可位于句首或句末。常译为“由于；鉴于”
10.______ it was raining, _______ they stayed at home.
A. Because; so B. Because; / C. Since; so D. As; so
【答案】B
【解析】because不能和so同时使用。
二、句型转换。
1 The students didn’t need to go to school because there was a storm.
The students didn’t need to go to school __________ ____ the storm.
【答案】 because of
2 He was ill, so he didn’t go to school.
_____________ he was ill, he didn’t go to school.
【答案】 Because
3. He couldn’t walk because his leg was broken.
He couldn’t walk ____________ ________ his _________ leg.
【答案】because of broken
4. I came back because it was raining heavily.
I came back ___________ ________ the ________ rain.
【答案】 because of heavy
5. My parents were angry because of my poor marks in the exam.
My parents were angry _________ I got poor marks in the exam
【答案】because
6. The football match was put off. It rained. (用because连接句子)
【答案】 The football match was put off because it rained.
7. Many people give up smoking because smoking has harmful effects. (用because of改写句子)
Many people give up smoking ___________________ .
【答案】 because of harmful effects
三、完成句子。
1. 他因为一场事故失去了双亲。
He lost his parents __________ _______ an accident.
【答案】Because of
2.既然你已经在这儿了，何不多待两天？
____________ you are here, why not stay for two more days
【答案】Since/As
3. 你生病了，最好去看看医生。
____________ you are ill, you’d better go to see a doctor.
【答案】As/since/because
4. 我没去那里，因为我不想见到他。
I didn’t go there _________ I didn’t want to see him.
【答案】because
5. 因为要赶去火车站，他们很早就起床了。
_______________ they needed to go to the train station, they got up early.
【答案】Since/As/Because
6. 因为下雨，运动会延期了。
The sports meeting was put off __________ ________ the rain.
【答案】because of
四、语法选择。
A
In northern Scotland there is a deep lake called Loch Ness. It is more than 200 metres deep and it is the ____1____ lake in the UK. People say
2 huge monster lives in the dark, cold water. It 3 more than
1,000 kilos and is at least ten metres long. Some people say that it looks like a snake 4 dark grey colour. Many people travel to Loch Ness 5 this strange monster. However, only 6 people say that they saw it. 7 knows whether（是否）these people really saw it or not.
People first 8 the story of the Loch Ness Monster over 500 years ago. ___9____ it became popular only in the twentieth century. ___10____1993, two people reported that they saw a big monster in the middle of the lake. From then on, many 11 people said they saw a monster in Loch Ness. A few photos ____12_____, but some of 13 weren't real. During the 1960s. people created an organization to 14 the truth. They took many photos and made movies. But they ___15_____ find a monster.
Now there are lots of curious（好奇的）people go there every year.
1 A. deep B. deeper C. deepest D. most deep
2 A. a B. an C. the D. /
3 A. weigh B. weighs C. weighing D. weighed
4 A. on B. to C. with D. by
5 A. looking for B. look for C. have looked for D. to look for
6 A. few B. a few C. little D. a little
7 A. Nobody B. Somebody C. Anybody D. Everybody
8 A. have told B. telling C. told D. tell
9 A. And B. So C. But D. Because
10 A. in B. on C. on D. at
11 A. other B. another C. the other D. others
12 A. was taken B. took C. were taken D. are taken
13 A. us B. them C. you D.it
14 A. find B. look for C. find out D. look after
15 A. can’t B. couldn’t C. mustn’t D. shouldn’t
【答案】CABCD BACCA ACBCB
B
Take a piece of hair from your head, It may be long, ____1___ it's not very wide. Three scientists spent over 30 years 2 a kind of machine. It is about a thousand times 3 than one piece of your hair. They are so small that people 4 only see it under a microscope(显微镜)！
They 5 it a name, nano-machine（纳米机器）.The three scientists won the Nobel Prize 6 their hard work. They 7 all European.
Doctor J. Fraser Stoddart, one of the scientists, told reporters that he thanked 8 other scientists from 24 different countries for helping make this prize possible. He said he once brought a chocolate Nobel Prize to his daughter from a trip to Stockholm. He hoped 9 a real one someday.
You may want to know 10 we can use nano-machine to do. Mr. Feringa compared 11 work to that of the Wright Brothers. 12 the Wright Brothers flew their airplane for the first time, some people thought that airplanes couldn't help them with anything. But airplanes now help us a lot in 13 places such as travelling and business. Scientists believe that in the future, nano-machine can help us in many ways, 14 . For example, it will be used to deliver（传送）medicine into 15 person's body, or take away things that makes us ill.
1. A. and B. or C. but D. so
2. A. invented B. invent C. to invent D. inventing
3. A. thin B. thinner C. thinnest D. the thinnest
4. A. must B. may C. can D. should
5. A. gave B. give C. will give D. gives
6. A. for B. to C. from D. at
7. A. is B. was C. are D. be
8. A. hundred B. hundred of C. hundreds D. hundreds of
9. A. have B. has C. to have D. having
10. A. how B. where C. what D. why
11. A. they B. them C. their D. theirs
12. A. Because B. When C. If D. Unless
13. A. much B. few C. little D. many
14. A. also B. too C. either D. both
15. A. a B. an C. the D. /
【答案】CDBCA ACDCC CBDBA
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Unit 7 The unknown world
Grammar 语法学习—原因状语从句
A 原因状语从句
在句中表示原因、理由的从句叫原因状语从句。
1 引导原因状语从句的从属连词主要有because, since, as。
2 表示语气的强弱顺序是：because﹥since﹥as。
3 这些连词都不能和so连用。
4 当原因状语从句放于句首时，通常要用逗号与主句隔开。
引导词because
1 because强调明确直接的因果关系，回答“why”问题
2 because从句可与for互换，但for是并列连词，连接的是并列句，并且在for前必须有逗号隔开。如：
引导词since
1 since表示明摆着的理由或原因，常译为“既然”
2 since还可引导时间状语从句，表示“自从……以来”
引导词as
1 as语气最弱，表示附带说明的原因
2 as还可引导时间状语从句，表示“当……的时候”、“随着……”。如：
B because与 because of的区别
because和because of的意思都是“因为；由于”。 但because 是连词，其后接句子。because of 是复合介词，其后接名词、代词、动名词、what 从句等。
语法练习
1、 单项选择。
1.We didn’t enjoy the day ______ the weather was so bad.
A. because B. though C. unless D. till
2 The baby is sleeping, _______ you’d better keep quiet.
A. but B. or C. because D. so
3 They were late for the meeting ______ the heavy rain.
A. because of B. because C. since D. as
4. It rained last night, _______ the ground is wet.
A. or B. for C. but D. though
5.She won’t go to the cinema ______ she has already seen the film.
A. until B. if C. so D. because
6 ______ you’re tired, you’d better stay at home and have a rest.
A. Since B. Or C. Though D. Till
7. — Why didn’t you go to the party — ______ I wasn’t invited.
A. As B. Since C. Because D. So
8. — Did you call Jack back
— I didn’t need to ______ I’ll see him tomorrow.
A. though B. because C. unless D. when
9. ______ we have no money, we can’t buy it.
A. Until B. Unless C. As D. Although
10.______ it was raining, _______ they stayed at home.
A. Because; so B. Because; / C. Since; so D. As; so
二、句型转换。
1 The students didn’t need to go to school because there was a storm.
The students didn’t need to go to school __________ ____ the storm.
2 He was ill, so he didn’t go to school.
_____________ he was ill, he didn’t go to school.
3. He couldn’t walk because his leg was broken.
He couldn’t walk ____________ ________ his _________ leg.
4. I came back because it was raining heavily.
I came back ___________ ________ the ________ rain.
5. My parents were angry because of my poor marks in the exam.
My parents were angry _________ I got poor marks in the exam
6. The football match was put off. It rained. (用because连接句子)
7. Many people give up smoking because smoking has harmful effects. (用because of改写句子)
Many people give up smoking ___________________ .
三、完成句子。
1. 他因为一场事故失去了双亲。
He lost his parents __________ _______ an accident.
2.既然你已经在这儿了，何不多待两天？
____________ you are here, why not stay for two more days
3. 你生病了，最好去看看医生。
____________ you are ill, you’d better go to see a doctor.
4. 我没去那里，因为我不想见到他。
I didn’t go there _________ I didn’t want to see him.
5. 因为要赶去火车站，他们很早就起床了。
_______________ they needed to go to the train station, they got up early.
6. 因为下雨，运动会延期了。
The sports meeting was put off __________ ________ the rain.
四、语法选择。
A
In northern Scotland there is a deep lake called Loch Ness. It is more than 200 metres deep and it is the ____1____ lake in the UK. People say
2 huge monster lives in the dark, cold water. It 3 more than
1,000 kilos and is at least ten metres long. Some people say that it looks like a snake 4 dark grey colour. Many people travel to Loch Ness 5 this strange monster. However, only 6 people say that they saw it. 7 knows whether（是否）these people really saw it or not.
People first 8 the story of the Loch Ness Monster over 500 years ago. ___9____ it became popular only in the twentieth century. ___10____1993, two people reported that they saw a big monster in the middle of the lake. From then on, many 11 people said they saw a monster in Loch Ness. A few photos ____12_____, but some of 13 weren't real. During the 1960s. people created an organization to 14 the truth. They took many photos and made movies. But they ___15_____ find a monster.
Now there are lots of curious（好奇的）people go there every year.
1 A. deep B. deeper C. deepest D. most deep
2 A. a B. an C. the D. /
3 A. weigh B. weighs C. weighing D. weighed
4 A. on B. to C. with D. by
5 A. looking for B. look for C. have looked for D. to look for
6 A. few B. a few C. little D. a little
7 A. Nobody B. Somebody C. Anybody D. Everybody
8 A. have told B. telling C. told D. tell
9 A. And B. So C. But D. Because
10 A. in B. on C. on D. at
11 A. other B. another C. the other D. others
12 A. was taken B. took C. were taken D. are taken
13 A. us B. them C. you D.it
14 A. find B. look for C. find out D. look after
15 A. can’t B. couldn’t C. mustn’t D. shouldn’t
B
Take a piece of hair from your head, It may be long, ____1___ it's not very wide. Three scientists spent over 30 years 2 a kind of machine. It is about a thousand times 3 than one piece of your hair. They are so small that people 4 only see it under a microscope(显微镜)！
They 5 it a name, nano-machine（纳米机器）.The three scientists won the Nobel Prize 6 their hard work. They 7 all European.
Doctor J. Fraser Stoddart, one of the scientists, told reporters that he thanked 8 other scientists from 24 different countries for helping make this prize possible. He said he once brought a chocolate Nobel Prize to his daughter from a trip to Stockholm. He hoped 9 a real one someday.
You may want to know 10 we can use nano-machine to do. Mr. Feringa compared 11 work to that of the Wright Brothers. 12 the Wright Brothers flew their airplane for the first time, some people thought that airplanes couldn't help them with anything. But airplanes now help us a lot in 13 places such as travelling and business. Scientists believe that in the future, nano-machine can help us in many ways, 14 . For example, it will be used to deliver（传送）medicine into 15 person's body, or take away things that makes us ill.
1. A. and B. or C. but D. so
2. A. invented B. invent C. to invent D. inventing
3. A. thin B. thinner C. thinnest D. the thinnest
4. A. must B. may C. can D. should
5. A. gave B. give C. will give D. gives
6. A. for B. to C. from D. at
7. A. is B. was C. are D. be
8. A. hundred B. hundred of C. hundreds D. hundreds of
9. A. have B. has C. to have D. having
10. A. how B. where C. what D. why
11. A. they B. them C. their D. theirs
12. A. Because B. When C. If D. Unless
13. A. much B. few C. little D. many
14. A. also B. too C. either D. both
15. A. a B. an C. the D. /
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