og_68

yiyi20

请大虾指教zone的形成为什么用被动?

redli

68. Often visible as smog, [U]ozone is formed in the
atmosphere from[/U] hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
(A)ozone is formed in the atmosphere from
(B)ozone is formed in the atmosphere when
(C)ozone is formed in the atmosphere, and when
(D)ozone, formed in the atmosphere when
(E)ozone, formed in the atmosphere from

D中ozone后有一个逗号，这样使的FORMED成为一个修饰成分而非谓动，
用IS没任何问题，当REACT后，OZONE就形成了，另外这是自然现象，一定用现在是。

[此贴子已经被lucylu于2002-11-29 19:53:58编辑过]

lucylu

谢谢redli帮忙把题目贴出来。
1.form，vt.应用被动表形成。
2.该句的关键是找到react with sunlight的主语，是hydrocarbons and nitrogen oxides，而不是ozone。
[em23]