prep 126 135 好难考虑选择, - ChaseDream

135. Sixty-five million years ago, according to some scientists, an asteroid bigger than Mount Everest slammed into North America, which, causing plant and animal extinctions, marks the end of the geologic era known as the Cretaceous Period.

C. there were less than one percent of homes with electricity, where lighting was still being

D. there was less than one percent of homes that had electricity, having lighting that was still

E. less than one percent of homes had electricity, where lighting had still been

A. which, causing plant and animal extinctions, marks

B. which caused the plant and animal extinctions marking

C. and causing plant and animal extinctions that mark

D. an event that caused plant and animal extinctions, and it marks

E. an event that caused the plant and animal extinctions that mark

D，it指代event, 那么and 后面的这个it是可以省略的，这样体现简洁。

以下是引用theone2007在2008-4-10 0:12:00的发言：

A. which, causing plant and animal extinctions, marks

B. which caused the plant and animal extinctions marking

C. and causing plant and animal extinctions that mark

D. an event that caused plant and animal extinctions, and it marks

E. an event that caused the plant and animal extinctions that mark

我在D E之间徘徊,it 我觉得是值代an event 因为event是同为语从句 ,而E中that值代很明显有误

126. In the major cities of industrialized countries at the end of the nineteenth century, important public places such as theaters, restaurants, shops, and banks had installed electric lighting, but electricity was in less than one percent of homes, where lighting was still provided mainly by candles or gas.

A. electricity was in less than one percent of homes, where lighting was still

B. electricity was in less than one percent of homes and lighting still

C. there were less than one percent of homes with electricity, where lighting was still being

D. there was less than one percent of homes that had electricity, having lighting that was still

E. less than one percent of homes had electricity, where lighting had still been

E A中徘徊

大家来谈谈自己的看法吧!

第一题：应该是extinctions mark，所以选E，that指代前面的extinctions。