题目内容

17．My sister _________ play the piano，but she ____________ sing well．（　　）
A．must； mustn'tB．can； can'tC．can't； can'tD．must； must

分析 我妹妹会弹钢琴，但她唱不好．

解答 答案：B．
must，一定，必须；mustn't不可以；can，能，会；can't不能，不会．根据My sister _________ play the piano，可知这里表示一种能力，所以用can，but前后应该是转折关系，所以后面用否定形式，表示不能．故选B．

点评 本题考查了情态动词的用法．解答时注意句意以及所给选项的意思并作出正确选择．

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7．How quickly can you count from o ne to ten？Do you use ten different words to do it？Can you do it in English，or do you have to use your first languages？Do you count on your fingers？Many people think that numbers and math are the same all over the world．But scientists have discovered that it is not true．
People in different parts of the world use different ways to count on their fingers．In the United States，people begin counting with their first fingers，which they extend or stick out．They then extend the rest of their fingers and finally the thumb （拇指） to count to five．Then they repeat this with the other hand to get to ten．In China，people count by using different finger positions．In this way，a Chinese person can easily count to ten on only one hand．
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In a similar study，researchers from the Massachusetts Institute of Technology discovered that people of the Piraha tribe （部落） in northwestern Brazil don't have words for numbers such as"one"or"three"．They are not able to say"five trees"or"ten trees"but can say"some trees"，"more trees"，or"many trees"．Professor Edward Gibson said that most people believe that everyone knows how to count，"but here is a group that does not count．They could learn，but isn't not useful in their culture，so they've never picked it up．"
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32．The writer begins with the four questions in order toB．
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C．tell a story              
D．solve math problems
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D．People of different cultures use the same way of finger counting．
34．Which of following is true about aboriginal Australians？D
A．They have only a few words for numbers．
B．They have hand movements to stand for numbers．
C．They can only count to five on their fingers．
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A．People from different cultures have different ideas about numbers and math．
B．Chinese people can count more easily on their fingers than Americans．
C．In some aboriginal culture，people don't even know how to count．
D．Some languages don't have number words because people don't need numbers．
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