OG 134

134. Canadian scientists have calculated that one human being should be struck every nine years by a meteorite, while each year sixteen buildings can be expected to sustain damage from such objects.

(A) one human being should be struck every nine years by a meteorite

(B) a human being should be struck by a meteorite once in every nine years

(C) a meteorite will strike one human being once in every nine years

(D) every nine years a human being will be struck by a meteorite（D）

(E) every nine years a human being should be struck by a meteorite

如果A改为 a human being will be struck every nine years by a meteorite, 行不行？

谢谢pumpkin mm，偶没注意到对仗。

那么，a human being will be struck every nine years by a meteorite和every nine years a human being will be struck by a meteorite的意思上有区别吗？

4）while的出现，要求前后需要一种结构的对称形式。

自由的拙见,请大家指教

134. Canadian scientists have calculated that one human being should be struck every nine years by a meteorite, while each year sixteen buildings can be expected to sustain damage from such objects.

所以,D比较对称结构,读起来很美.虽然OG 没提到这个知识点,不过自由琢磨,这也是ETS一个重要的考题思路吧?

Also, the language of C implies more than can reasonably be maintained: i.e., that a meteorite will strike one person, and no one else, exactly once during every nine-year period.(定冠词使用得准确性上—one是定冠词，确指一个人)

摘自OG菜鸟手册

one 是定冠词？

我觉得楼上的分析不对，错误原因是因为用了once（仅仅一次）。

如果是平均2个人呢？ 不是一定要用two吗（two human beings）？所以我觉得主要原因是once。

可是og有特别强调了不定冠词a的优点，这我就不明白了?

要不就是我理解的one（the single unit or thing) 和ets理解的one (only，such as :the one person she want to marry) 不一样？？？？？？？？

请谁帮帮忙，指点一下

以上是longman对a的解释.  而one强调的是数量, 一个且只有一个. 体会一下这两个词的差别, 相信会理解OG prefer