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．School and Education.B．Individuals in the United States.C．Responsibilities as Citizens.D．Tomorrow’’s Decision-makers.
A．School and Education.
B．Individuals in the United States.
C．Responsibilities as Citizens.
D．Tomorrow’’s Decision-makers.
单项选择题
A．Cheese burger.B．Fries.C．Coke.D．Diet Pepsi.
A．Cheese burger.
B．Fries.
C．Coke.
D．Diet Pepsi.
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