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问题 解答题

已知f（x）=3x+6．求f（2），f（a），f（m+n），f（f（x））．

答案

f（2）=3×2+6=12，f（a）=3?a+6=3a+6，

f（m+n）=3?（m+n）+6=3（m+n）+6，

f（f（x））=3?f（x）+6=3（3x+6）+6=9x+24．

听力题

A passenger told all air hostess(空姐)that he needed a cup of water to take his 小题1:when the plane just took off. She said to him,“I’ll bring you the water   小题2:  ten minutes."

Thirty minutes later, when the passengerring for service sounded, the air hostess ran ill a hurry .She Was so busy that she 小题3: to bring him the water. As a小题4:.the passenger couldn’t take his medicine in lime. The air hostess hurried over to him with a cup of wale. but he  小题5: it.

After a short while, the air hostess came up to him with a smile,” Could you please tell me what I can do for you, sir? "The passenger turned around without any words. The second time .also with a sweet smile, "Would you like 小题6: I can do for you?” Again the passenger refused.

In the following hours 013.the flight, each time the air hostess passed the passenger, she would ask him 小题7:a smile whether he needed some help or not. But the passenger never replied to her. When the passenger was going to get 小题8:the plane, he asked the air hostess to hand him the passenger's booklet (小册子).She knew that he would write down terrible words about her job.   小题9:still with a smile she handed it to him.

Getting off the plane. the air hostess opened the booklet, and smiled because the passenger wrote,” How can I refuse your twelve sweet    小题10: ?"
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