Betty hasn't got any hobbies you call sleeping a hobby．( )A．whenB．becauseC．beforeD．unless 题目和参考答案——青夏教育精英家教网—

题目内容

19．Betty hasn't got any hobbies _______ you call sleeping a hobby．（　　）

A．

when

B．

because

C．

before

D．

unless

分析句意：除非你把睡觉叫做爱好，Betty没有任何爱好．

解答 A．when 意为当…的时候； B．because意为因为； C．before意为在..之前； D．unless 意为除非
本句句意为Betty没有任何爱好，____你把睡觉叫做爱好．因此应该是"除非"，选D．
故选：D

点评本题旨在考查when，because，before and unless 的辨析，根据句意和单词意思，即可得出答案．

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3．When our teacher heard of the news，he was too angry to say_{_____}．（　　）

7．-______can you finish your homework？
-In about one and a half hours．（　　）

14．你多长时间去看一次电影？How often do you see a film？（how often ）

4．My mother is ill．I have to ______ her in the hospital after class．（　　）

11．Sorry，sir．I made a mistake again．
---________．Practice more and you will do better．（　　）

	A．	All right．		B．	Never mind
	C．	Don't mention it

--- ________ I know by what time you want the report to be done?

--- By the day after tomorrow. ______ you finish it on time?

A. May; Can B. Must; Need

C. Could; Must D. Need; Would

What is the first thing you want to do when you see someone yawn(打哈欠)? You want to yawn, too! Yawning is contagious.

Scientists have found that all people yawn. Babies start to yawn even before they are born. The earliest yawn takes place when a baby is still inside its mother. When young children are about one year old, they start to yawn when they see others yawning. That's why scientists seem to think yawning is contagious.

It’s no secret that yawning is contagious, but why do we yawn? Well, scientists are not really sure.

Some think we yawn because we feel bored. Recently scientists studied two groups of students between the ages of 17 and 19. One group watched music videos, and the other watched a boring color test. Scientists compared the numbers of their yawns and found that the color test group yawned more times than the video group.

Another reason about yawning has to do with breathing. Some scientists believe that when we are bored or tired, we breathe more slowly. As our breathing slows down, we cannot get rid of(去除) enough carbon dioxide (CO2) in our bodies. When there is too much carbon dioxide, our bodies will tell the brains (大脑) to breathe deeply. The result is a big yawn.

In 2007, scientists suggested a new reason. They said that the reason people yawned was to cool down their brains. These scientists found that people who were warmer than others yawned more often.

Scientists are still trying to find out why yawning happens and why it is so contagious. But they are only sure that when one person yawns, almost everyone else nearby wants to yawn, too.

1.According to the scientists, people start to yawn when they are .

A. born

B. inside their mothers

C. 17 or 19 years old

D. one year old

2.Which of the following are the possible reasons about yawning according to the passage?

People yawn because they are bored.

People yawn to catch others' attention.

People yawn to cool down their brains.

People yawn to get rid of carbon dioxide.

A. B. C. D.

3.We can probably read this passage in a _ _.

A. story book B. travel guidebook

C. science magazine D. movie poster

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