I.听力： （每题1.5分，共30分）
第一节：请听下面5段对话；每段对话后有一个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听完每段对话后，你都有l0秒钟的时间来回答有关小题和阅读下一个小题。每段对话仅读一遍。
1. What do scientists think of the advertisements on TV?
A. They are boring.
B. They are good for our eyes.
C. It’s a waste of time to advertise on TV.
2. How many knives did the man buy?
A. Three. B. Two. C. One.
