Unit 1 Festivals around the world(4)

water taste salty？” Scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask, “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.

We know a lot about our world, but there are still many answers that we do not have, and we are curious.

1．According to the passage, which of the following statements is true? A．People are curious in the same way.

B．People in different countries are interested in different things. C．Men and women are curious about different things.

D．People of different ages are interested in different things. 答案 D

解析 第二段最后说到：小孩子不同的兴趣和好奇心，会影响他们未来的职业生涯；后又说到不同的科学家研究的领域不同。由此得出答案。

2．Scientists who work with the biological sciences study ________． A．the earth, the oceans and the sky B．man－made things C．plants and animals D．ocean water 答案 C

解析 生物学家研究的内容当然是动植物了。 3．When you run, your muscles need ________． A．more nutrition and oxygen B．more signals C．more salt D．water 答案 A

解析 由第四段中“When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too.”可知答案为A。

4．A rock cracks ________． A．in wet regions B．in dry regions

C．at very high or very low temperatures D．when salty water falls in 答案 C

解析 由第五段中“When a rock gets very hot or very cold, it cracks.”可知答案为C。 5．People are always curious because ________．

A．they cannot explain many things B．they know nothing about the world C．they know little about the world D．they want to be scientists 答案 A

解析 最后一段告诉我们，人类还有很多问题无法回答。

Period Three Grammar & Writing

Ⅰ.单项填空

1．—Must he come to sign this paper himself? —Yes, he ________.

A．need B．must C．may D．will 答案 B

解析 句意：“他必须过来亲自签署这份文件吗？”“是的，必须。”must可以表“推测”或“必须”，当表示“必须”时，肯定答语也必须用must。

2．—Many houses near the airport were destroyed by the wind. —Well, the wind ________ have been very strong. A．can B．must C．need D．should 答案 B

解析 句意：“机场附近的很多房子都被风摧毁了。”“哦，那场风一定很大。”can表示实际的可能性时，常用于否定句和疑问句中，用于否定句时，意为“不可能”；must表示接近事实的肯定推测，用于肯定句；need表示“需要”；should表推测时常表示“合乎情理的事或结果”。故选B。

3．How ________ you say that you really understand the whole text if you have covered only part of it?

A．can B．must C．need D．may 答案 A

解析 句意：如果你只读了这篇文章的一部分，你怎么能说你真正理解了整篇文章呢？can“能，能够”，表吃惊。

4．—Isn't that your boss over there?

—No, it ________ be him. I'm sure he is in the office now. A．can't B．must not C．won't D．may not

答案 A

解析 can't表示不可能；must not表示禁止；won't表示不愿或不会；may not表示可能不。根据语境及答语中的“I'm sure”，表示答话的人肯定那个人不是他/她的老板。

5．When we lived in that village, we ________ often play together in the river there. A．might B．should C．could D．would 答案 D

解析 句意：当我们在那个村庄生活的时候，我们经常一起在那里的河里玩耍。would在此表过去习惯性的动作。

6．Facts prove that the world's economic development is not a win－lose game but one in which all ________ be winners.

A．can B．shall C．must D．would 答案 A

解析 句意：事实证明世界经济的发展不是一方胜出另外一方失败的游戏，而是所有参与者都有可能是赢家的游戏。can表示在逻辑上具有某种可能性。

7．You ________ leave the window open. It's so cold. A．mustn't B．needn't C．mightn't D．won't 答案 A

解析 考查情态动词。句意：你不可以让窗子开着，天太冷了。mustn't绝不可以；needn't不必； mightn't可能不；won't不必。结合句意知选A。

8．You ________ do the exercise if you don't want to. A．may not B．can't

C．mustn't D．needn't 答案 D

解析 句意：如果你不想做练习，就不必做。may not可能不；can't不可能；mustn't绝不可以；needn't不必。结合句意知选D。

9．—________ I turn up the TV a little?

—Sorry, you ________. You will wake the baby up. A．May; might B．Could; couldn't C．Might; mustn't D．Can; shouldn't 答案 C

解析 句意：“我能把电视音量调大一点吗？”“很抱歉，不能。你会把孩子吵醒的。”might

表示委婉的请求；mustn't在此处表示禁止。

10．You ________ pay more attention to your behavior next time. A．would B．can C．will D．shall 答案 D

解析 句意：下次你要多注意你的举止。would将会；can能够；will将会；shall用于第二人称陈述句，表示说话者的警告，意为“必须”。故选D。

11．It is surprising that that mean man ________ give away his money to the poor. A．should B．would C．can D．must 答案 A

解析 句意：那个吝啬鬼竟然把钱捐给穷人，太令人吃惊了。should用来表示惊讶的语气“竟然”。

12．—To stop the oil from flowing into the gulf is difficult. What should we do? —________ the robots have a try?

A．Shall B．Must C．Will D．May 答案 A

解析 shall用于第一、三人称疑问句中，表示说话人征求对方的意见或向对方请示。 13．When winter comes, ________ spring be far behind? A．must B．should C．will D．can 答案 D

解析 must表示推测，用于肯定的陈述句中，表示有一定事实根据的推测，意为“一定；肯定”；should表示根据常理、常规或对一般情况的推测，意为“应该会”；can表示逻辑上、理论上的可能性。句意：冬天来了，春天还会远吗？此处为理论上的推测，故选D。

14．—Could I use your pen? —Yes, of course you ________. A．might B．will C．can 答案 C

D．should

解析 原题中的could不是过去式，而表示一种委婉、客气的礼貌用语。因此用could提问时，用can回答。同样用would，might提问时，用will和may回答。

15．They were determined to carry out the plan at first, but then we ________ persuade them to change their minds.

A．would B．could

C．were able to D．had to 答案 C

解析 句意：他们一开始决定执行这个计划，但后来我们设法说服他们改变了主意。句中be able to do＝manage to do意思是“设法做成”。

16．________ is often the case with children，Amy was better by the time the doctor arrived. A．It B．That C．What D．As 答案 D

解析 句意为：就像其他小孩子一样，医生来的时候Amy好多了。as is often the case通常就是这样，此处as 引导定语从句。

17．Jim ________ a late night film at home when，right in the middle of a thrilling scene，the television went blank.

A．watched B．had watched

C．was watching D．would be watching 答案 C

解析 句意为：Jim正在家中观看一部午夜电影，(突然)这时电视上的恐怖画面变成了一片空白。

18．I have heard a lot of good things about you ________ I came back from abroad. A．since B．until C．before D．when 答案 A

解析 句意为：自从我回国以来，听到了你的很多好消息。since自从……以来(至今)，与主句现在完成时匹配。

19．Marco Polo is said to have sailed on ________ Pacific Ocean on his way to Java in ________ thirteenth century.

A．the；a B．a；/ C．/；the D．the；the 答案 D

解析 句意为：据说十三世纪时马可波罗曾经横渡太平洋前往爪哇。世界七大洲前不加the，而四大洋前需要加the。in the...century意为“在……世纪”。

20．It remains to be seen ________ the newly formed committee's policy can be put into practice.

A．that B．which C．what D．whether 答案 D

解析 句意为：新成立的委员会提出的方针能否实行还有待观察。It作形式主语，whether

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