单项选择题

The study also notes a steady decline in the number of college students taking science courses.

A. relative
B. general
C. continuous
D. sharp
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单项选择题
He asserted that nuclear power was a safe and non-polluting energy source.
A. maintained
B. recommended
C. considered
D. acknowledged
单项选择题
Anderson left the table, remarking that he had some work to do.
A. doubting
B. saying
C. thinking
D. knowing
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