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 are the two speakers talking about?
A. Clear water. B. Some plants. C. Nuclear power.
2. What can we learn from the conversation?
A. Something is on fire.
B. The two speakers don’t smoke.
C. Smoking is forbidden there.
