单项选择题
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A.The woman is hard-working.
B.The woman should take fewer jobs.
C.The woman should take care of the man.
D.The woman is in bad health.
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单项选择题
Human beings have already made use of ______ .
A.nuclear energy in the lab under the sea
B.salt water resource as fresh water
C.minerals, chemicals and oil taken from the sea
D.farms under the sea
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单项选择题
One way of producing cold is to allow ______ .
A.a liquid to move slowly
B.a liquid to evaporate
C.a gas to evaporate
D.a molecule to move slowly
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