单项选择题

A （）landing roll will be required if the landing speed is higher.

A.shorter
B.longer
C.smaller
D.bigger

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单项选择题

Travelers do not （）the sort of risks they need to in the past.

A.occur
B.incur
C.invite
D.run

单项选择题

We all like that teacher because of his nice （）of humor.

A.principle
B.feeling
C.sense
D.willingness

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