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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A．gameB．matchC．playD．sports
A．game
B．match
C．play
D．sports
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A．playB．gameC．sportD．pastime
A．play
B．game
C．sport
D．pastime
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