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。 How many cars can be parked in the back lot
A total of 15.
B. A total of 30.
C. A total of 50.
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__________________(要任何情况下，中国都不首先) use nuclear weapons.
无定形沉淀要在较浓的热溶液中进行沉淀，加入沉淀剂速度要适当快。( )
A. 对
B. 错
Questions 11 to 18 are based on the conversation you have just heard.
A. They should wait longer for Jane.
B. Jane probably won’t come.
C. He forgot to tell Jane to come.
D. Jane is very busy.
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