15．-Look at the boy running on the ground．Is it David？
-It _______ be him．I saw him go to the teacher's office just now．（　　）
A．canB．mustC．can'tD．might

分析 --看那個(gè)在操場(chǎng)上跑的男孩，是David嗎？
--不可能是他．我剛剛看到他去老師的辦公室了．

解答 答案：C．
can，能，可能；must一定，必須；can't不可能；might可能，may的過(guò)去式．根據(jù)I saw him go to the teacher's office just now，可知我剛剛看到他去老師的辦公室了，所以那個(gè)在操場(chǎng)上跑的男孩不可能是David．can't不可能．故選C．

點(diǎn)評(píng) 本題考查了情態(tài)動(dòng)詞的用法．解答時(shí)注意理解句意以及所給選項(xiàng)的意思并作出正確選擇．

練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：初中英語(yǔ) 來(lái)源： 題型：填空題

7．Today is Tom'sninth birthday．He is now a grade two student．（nine）

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源： 題型：選擇題

8．You can't play computer games        you finish your homework．（　�。�
A．becauseB．unlessC．ifD．since

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源： 題型：選擇題

3．Mr．King is from the USA．He has blue eyes and a big ________/n??z/（　　）
A．noteB．neckC．noseD．north

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源： 題型：閱讀理解

10．Humans have five senses：sight，hearing，smell，taste and touch．They collect information for the brain．For example，the eyes collect information on pictures and the ears collect information on sounds．
Sometimes a person loses a sense．Their other senses become better．For example，a blind person has much better senses of hearing and touch．
Sight
The eyes can only see with light．Light carries the picture of something into the eyes so humans can see it．But do you know that the picture is upside down？The brain has to turn the picture the right way up again．
Hearing
Sounds travel through the air like waves （波）．Human ears are like cups．They catch sound waves for the brain and the brain translates them as different sounds．
Smell
Humans smell with their noses．Most people can recognize about 10，000 kinds of smell．This is amazing!Humans each have five million receptor cells （感受細(xì)胞）in their noses．Noses are not only for smelling．They also clean and warm the ail that people breathe in．How does the nose prevent the dirty air from getting into the body？Well，it sneezes（打噴嚏）！
Touch
There are receptor cells for the sense of touch all over the body．This is different from the other senses．Touch receptor cells are in the lowest part of the skin．They help the body to have all kinds of feelings like pain，cold and heat．Some parts of the body （like the finger） are more sensitive（敏感的）than other parts of the body （like the back） because they have more touch receptor cells．
Taste
People can taste food because they have about 10，000 taste buds（味蕾）on their tongues．Old taste buds die and new ones come out every two weeks．But when people get older，this happens less often．That's why old people often complain their food is tasteless．Scientists also find that smokers have fewer taste buds．Do you want food to taste good？Well，don't smoke!
For hundreds of years，people knew the basic tastes were sour，sweet，salty and bitter（苦）．In 2002，a fifth taste，umami（delicious taste） joined the list．Now，a study from Purdue University in the US found that fat could actually be the sixth basic taste．
To be considered a basic one，a taste needs to beable to active certain receptor cells in the mouths．A study has shown that humans have fat receptors in the mouths．Not long after that，a scientist made a study to test a second question：can people taste the difference between fat and other tastes？
Richard Mattes gave the testers six different kinds of things．Each kind had a taste：sweet，salty，sour，bitter，umami or the newcomer-fat．Mattes asked the people to pick out tastes by their differences．This was to test whether or not fat would be picked out from the group．Most of tlie testers could clearly find out the different taste of fat．
Then how does fat taste？"It's terrible．"Mattes said．"However，the taste can be pleasant in a small amount，just as we enjoy the bitterness of chocolate．"
 senses （111）
parts of the body/collectors/organs		facts about the senses 
sighteyesPictures of real things are completely different in（112）brainfrom those carried by light into the eyes．
hearingearsSound waves caught by ears must go through a process like（113）translatingso that we can hear different sounds．
smellnoseThe fhnctions of nose are smelling，cleaning and warming the air people breathe in．Sneezing is the way to（114）take outthe dirty air we breathe in．
touch（115）
skin		People feel pain，cold and heat（116）because ofthe fnction of the receptors．So the more touch receptors we have，the more sensitive we are．
tastetongueOld taste buds die and new ones come out every 2 weeks．
Losing a certain amount of taste buds（117）causesthat the old and the smokers have a bad sense of taste．They can't enjoy tasty food like others．
（118）basic tastessour sweet salty bitter umami
one newly found tasteA scientific study has proved people have fat receptors
in the mouth．One（119）
more
study shows：people can clearly（120）tell

the taste of fat from other tastes．

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源： 題型：填空題

20．Teacher Li gave us somesuggestions（suggest） about how to improve our pronunciation..

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源： 題型：填空題

7．He is thefunniest （fun） person that I have ever seen．

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源： 題型：選擇題

4．Nan'ao is _______ island city．It's such _______ nice place that many tourists come here every year．（　　）
A．an；/B．the；/C．an； aD．a； a

查看答案和解析>>

科目：初中英語(yǔ) 來(lái)源： 題型：填空題

5．為了確保信息正確，他反對(duì)核對(duì)．
Tomake sure his information was right，he checked it again and again．

查看答案和解析>>

同步練習(xí)冊(cè)答案