单项选择题

Some geologists are particularly interested in the layers of ______ surface.

A．the earth's
B．earth's
C．the earth
D．earth
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单项选择题
______ the rhinoceros have very poor eyes, the hunters had better stay out of range of the rhinoceros' sights.
A．Though
B．Since
C．While
D．Despite
单项选择题
You ______ drive carefully. The roads are wet.
A．had rather
B．would rather
C．had better
D．would like to
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