题目内容

A．underB．outsideC．insideD．behind

A. under
B. outside
C. inside
D. behind

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Without our ______ means of air transportation—the aeroplane, we would have to slow our lives and commerce.

A. principal
B. central
C. principle
D. protective

A．asB．thatC．muchD．long

A. as
B. that
C. much
D. long

Owing to the heavy fog, our plane was______two hour.

A. delayed
B. cancelled
C. postponed
D. increased

Don't be______by difficulties.

A. discouraged
B. disappointed
C. discarded
D. dismissed