单项选择题

The lowest point between two waves is called（）.

A.though
B.tough
C.through
D.trough

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单项选择题
In summer, monsoon over the South China Sea blows from（）.

A.northeast
B.southwest
C.southeast
D.northwest
单项选择题
As to the torn bags,I’ll tell the shipper to（）them up.

A.Resew
B.Rejoin
C.Renail
D.Resolder
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