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标题: 关于百分数前的冠词问题 [打印本页]

作者: 裘球球 时间: 2014-9-12 16:28
标题: 关于百分数前的冠词问题

As a result of the ground-breaking work of Barbara McClintock, many scientists now believe that all of the information encoded in

50,000 to 100,000 of the different genes found in a human cell are contained in merely

three percent of the cell’s DNA.

(A) 50,000 to 100,000 of the different genes found in a human cell are contained in merely

(B) 50,000 to 100,000 of the human cell’s different genes are contained in a mere

(D) 50,000 to 100,000 of human cell’s different genes is contained in merely

(E) the 50,000 to 100,000 different genes found in a human cell is contained in a mere

请问E中in a mere 3 percent of the DNA为什么要加a 呢？

作者: 裘球球 时间: 2014-9-12 18:47
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