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．By expanding their minds and horizons.B．By financing their elementary education.C．By setting up a small primary school.D．By setting them an inspiring example.
A．By expanding their minds and horizons.
B．By financing their elementary education.
C．By setting up a small primary school.
D．By setting them an inspiring example.
单项选择题
Several tourism companies believe space travel is going to be a new profitable industry.
A．Y
B．N
C．NG
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