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问题 选择题
已知函数y=ax的反函数的图象过点（9，2），则a的值为（　　）
A．3B．-3C．log29D．
1
3
答案

依题意，点（9，2）在函数y=ax的反函数的图象上，

则点（2，9）在函数y=ax的图象上

将x=2，y=9，代入y=ax中，

得9=a2

解得a=3

故选A．

选择题

I am talking ________ you.[ ]

A. to    

B. for      

C. at
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填空题

短文填空

     I know how easy it is to start smoking and how difficult it is to stop. During adolescence, I became

   1   to cigarettes. When l was young, I didn't know that it could do   2   to my heart and lungs. Neither

did I know that my cigarette smoke could affect the   3   of non-smokers. However, what I did know was that my girlfriend thought I smelt terrible and that she wouldn't go out with me again   4   I stopped. 1 also noticed that I became breathless quickly. Then I knew   5   was time to quit smoking. I'm sending you

some advice to help you__6  your resolve. Every time you feel like   7  (smoke), remind yourself that you

are a non-smoker. I know it is not easy to get rid of the __8__, but millions have managed   9_ (quit) and

so can you. Keep trying, and you will   10   eventually.
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