单项选择题


If School X purchased 300 textbooks in1971 and all of these textbooks either were counted in the inventory or had been discarded before the inventory， what percent of these textbooks had been discarded（）

A. 10%
B. 20%
C. 50%
D. 80%
E. 100%

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单项选择题
If the mean score for the iuniors were known，which of the following could be calculated from the information given Ⅰ The range of the scores for the seniors Ⅱ The median score for the juniors Ⅲ The mean score for the seniors（）

A. None
B. Ⅰ only
C. Ⅲ only
D. Ⅰ and Ⅱ
E. Ⅱ and Ⅲ
单项选择题
For the two years in which earnings from electronic operations were most nearly equal，the combined earnings from nonelectronic operations were most nearly（）

A. $340 million
B. $520 million
C. $670 million
D. $780 million
E. $1，520 million
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