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 much money is this stamp

A．The plane may explode in the air.
B．The pilot may lose control of the plane.
C．The engines may be damaged.
D．Too much air may get into the plane.

A．the amount of air in the plane
B．the strength of the plane structure
C．the pressure inside and outside the plane
D．the power of the airplane engines