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14．-_______ hours do you exercise every day？
-Three．（　　）

A．

How long

B．

How far

C．

How many

D．

How much

分析 --你每天鍛煉多少個小時？
--三小時．

解答答案：C．考查疑問詞組．句意"你每天鍛煉多少個小時？三小時．"．how long多久，對一段時間或長度提問．how far多遠，對距離提問．how many多少，修飾可數名詞復數．how much多少，修飾不可數名詞．根據three三，可知對數量提問，hours小時，名詞復數，可知應該用How many多少，答案是C．

點評疑問詞組通常用來構成疑問句，要根據回答的具體內容進行選擇，注意一些固定搭配，分清疑問詞的用法．

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科目：初中英語 來源： 題型：閱讀理解

4．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 horn．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 17and 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 （大腦） 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．

52．The underlined word"contagious"in Paragraph 1 meansB．
A．helpful to our health                    B．passing from one person to another
C．hard to understand                     D．getting into one trouble after another
53．According to the scientists，people start to yawn when they areD．
A．born                          B．one year old
C.17or 19years old                      D．inside their mothers
54．Which of the following are the possible reasons about yawning according to the passage？D
①People yawn because they are bored．②People yawn to catch others'attention．
③People yawn to cool down their brains．④People yawn to get rid of carbon dioxide．
a．①②③B．②③④C．①②④D．①③④
55．We can probably read this passage in aD．
A．story book                               B．travel guidebook
C．movie poster                              D．science magazine．

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