企业一定时期的生产费用等于其同一时期的产品成本（ ）
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分批法下，若是单件生产，则不存在在产品的计件问题（ ）
A. 对
B. 错
Much of his success ____ his powers of imagination.
A. is contributed to
B. is credited to
C. is approved by
D. is caused by
Professor Wang won the Presidential Award for his excellence in ____ students’ creative imagination.
A. believing in
B. bringing up
C. giving rise to
D. stimulating
The fellow said he didn’t give a ____ for life so why should he fear death?
A. fig
B. trifle
C. remark
D. flaw
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