单项选择题

A．They may crash because of nature disasters or human faults.
B．The world’s weather conditions are getting worse.
C．The airport safety inspections are getting worse.
D．Airplanes are often overloaded nowadays.
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单项选择题
A．He is very quiet.B．He should give more than one series of talks.C．He gives amusing lectures.D．He lectures only to the serious students.
A．He is very quiet.
B．He should give more than one series of talks.
C．He gives amusing lectures.
D．He lectures only to the serious students.
单项选择题
A．People’s health.B．The end of the world.C．People’s lives and futures.D．The Great Depression of 1929.
A．People’s health.
B．The end of the world.
C．People’s lives and futures.
D．The Great Depression of 1929.
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