单项选择题

Doctors often make higher ______ for their works than they should.

A. charges
B. bills
C. costs
D. payments
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单项选择题
Though it was late in the night, ______ he continued to work vigorously.
A. but
B. yet
C. and
D. that
单项选择题
One of the most spectacular qualities of man is notably his ______ to any kind of natural environment.
A. tendency
B. adoptability
C. adaptability
D. availability
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