单项选择题
The nutrients in whatever falls into the ocean will quickly become _____ other living things.
A. convenient for
B. available to
C. eaten by
D. unfit for
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单项选择题
It will be her mental attitude that ____ her future.
A. deletes
B. decides
C. determines
D. delivers
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单项选择题
The vacuum cleaner is a valuable labor-saving ______.
A. device
B. engine
C. piece
D. instrument
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