第一节
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10秒钟的时间来回答有关小题和阅读下一小题。每段对话仅读一遍。
What time is it now

A．thin
B．high
C．thick
D．heavy

A．fight and kill a lot of themselves
B．move from place to place constantly
C．lose a lot of their young
D．double their number every year