一道老题，其他选项明显错，就不说了，但正确答案里有一个语法点不懂
As a result of the ground-breaking work of Barbara McClintock, many scientists now believe that all of the information encoded in the 50,000 to 100,000 different genes found in a human cell is contained in a mere three percent of the cell’s DNA.
a mere three percent of the cell’s DNA为什么要加a？
好象抽象名词可以用: a 5 percent increase, 这里three percent of the cell’s DNA也可以用吗？多谢！[em13]作者: princess 时间: 2002-11-1 01:55
sigh 偶搞不定呃
哪位高人指点啊作者: tongxun 时间: 2002-11-1 01:55
a 在这里的用法可能是泛指某类物质。
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