PREP08 202 as,than可以做比较从句的主语 怎么理解呢

Lynsey玲

202.Providing initial evidence that airports are a larger source of pollution than they were once believed to be, environmentalists in Chicago report that the total amount of pollutant emitted annually by vehicles at O’Hare International Airport is twice as much as that which is being emitted annually by all motor vehicles in the Chicago metropolitan area.
A. as much as that which is being emitted annually by all

B. as much annually as is emitted by the

C. as much compared to what is annually emitted by all

D. that emitted annually by all           (D)

E. that emitted annually compared to the



题目释义：Providing initial evidence..., environmentalists…the total amount of pollutant emitted annually by vehicles at O’Hare International Airport is twice….

考点：
3. as,than可以做比较从句的主语，例：

In one of the bloodiest battles of the Civil War, fought at Sharpsburg, Maryland, on September 17, 1862, four times as many Americans were killed as would later be killed on the beaches of Normandy during D-Day.As指代了Americans。

as,than可以做比较从句的主语 怎么理解呢

kiwifoodtown

建议LZ先去去了解一下比较状语从句的结构特点。