题目内容

低于0oC—8oC为()的保存温度

A. 黑白相纸
B. 彩色相纸、光面相纸
C. 彩色相纸
D. 一般彩色感光材料

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In 1995,an average of _______ of domestic travelers went on sightseeing in China.

A. 52.4%
B. 54.2%
C. 56.4%
D. 54.6%

____ you were busy, I wouldn’t have bothered you with questions.

A. If I realized
B. Had I realized
C. I realized
D. As I realized

_____ your timely advice,I would never have known how to go about the work.

A. Unless
But for
C. Except for
D. Not for

He left orders that nothing _____ touched until the police arrived there.

A. should be
B. ought to be
C. must be
D. would be

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