单项选择题

A．There are no rapids or waterfalls.
B．There is a constant, strong wind.
C．Navigation is rather difficult.
D．Frequent storms cause problems for riverboats.
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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.
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.
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.
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