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
Because cows ______ meat and milk, they are valued in many countries.
A．both produce
B．both product
C．produce both
D．product both
单项选择题
Excuse me, but it is time to have your temperature ______.
A．taking
B．to take
C．take
D．taken
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