单项选择题

Another natural ______ that contributes to the welfare of the country is water.

A. source
B. mineral
C. power
D. resource
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单项选择题
Mary will not be able to come to the birthday party as she is ______ with a cold.
A. laid out
B. laid up
C. laid by
D. laid down
单项选择题
To make this ______ clear we shall have to look closely into biology's long history.
A. distinction
B. indication
C. recognition
D. constitution
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