[求助]OG-68 非常不解!!!!!

Across

68. Often visible as smog, ozone is formed in the

atmosphere from 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

In choice A, the construction from hydrocarbons and nitrogen oxides ... react is ungrammatical.

From是介词, 介词后面只能接名词, 不能接句子!!!!

In B, the best choice, the conjunction when replaces the preposition/row, producing a grammatical and logical statement.

In choice C, the use of the conjunction and results in the illogical assertion that the formation of ozone in the atmosphere happens in addition to, rather than as a result of, its formation when hydrocarbons and nitrogen oxide react with sunlight.

偶的问题就是C里面这个意思, 到底是怎么读出来的??? 因为这里C没说有语法错误, 那么意思不对. 这个意思倒是算什么意思???

and 前后的并列成分说的是什么??

不得要领

请指教

tianwan

正常人看到C，一个主句和一个从句并列，肯定错。

ETS的天才们看到的C是：Often visible as smog, ozone is formed in the atmosphere, and (ozone is formed) when hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.

2045977

C虽然没有语法错误，但是不符科学现象。题目的意思是：ozone是当hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight后产生于atmosphere的.注意，这里的react 是指hydrocarbons and nitrogen oxides与sunlight进行react.

一开始，我以为是ozone与sunlight 进行react,还错误地选了d。南瓜妹妹，你明白我的意思了吗？

Across

以下是引用tianwan在2004-4-18 17:32:00的发言：

正常人看到C，一个主句和一个从句并列，肯定错。

ETS的天才们看到的C是：Often visible as smog, ozone is formed in the atmosphere, and (ozone is formed) when hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.

呵呵呵呵, 偶是脑子彻底坏掉了......

谢谢TIANWAN gg 讲解.

明白了

Across

以下是引用2045977在2004-4-18 18:55:00的发言：

C虽然没有语法错误，但是不符科学现象。题目的意思是：ozone是当hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight后产生于atmosphere的.注意，这里的react 是指hydrocarbons and nitrogen oxides与sunlight进行react.

一开始，我以为是ozone与sunlight 进行react,还错误地选了d。南瓜妹妹，你明白我的意思了吗？

多谢jj指点. 偶没有想那么仔细

这个题目偶是这样:

DE句子不完整, 错.

C是句子不完整, and 使得从句分句并列, 错.

未划线的地方有个react是谓语动词==>只能是分句的谓语, 那么A肯定错.

只有b能凑合看看.

谢谢啦