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 did the man plan to go to Boston

A．sucker plants grow beside the parent plant and create new banana plants
B．a new generation of parent plants grows next to the sucker plants
C．growing next to the parent plant helps sucker plants make a new generation of banana plants
D．parent plants have sucker plants growing beside them: two generations of plants thus grow together

A．show that silver and gold are previous metals
B．show that one should convert paper money to gold
C．explain the nature of money
D．show that anything can serve as money in modem times