单项选择题

（）difficulties we may come across, we will help one another to get over them.

A．Whichever
B．Whatever
C．However
D．What

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单项选择题

Research into the dynamics of storms is directed toward improving the ability to predict these events （）to minimize damage and avoid loss of life.

A．and thus
B．so
C．however
D．because

单项选择题

Gravity is sure to play an important part, （）the ball （）into the air won’t go up.

A．as, thrown
B．for, thrown
C．since, throwing
D．as, throwing

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