Prep104的as compared to 和31的compared with

 104. In the United States, while the number of foreign-born residents and their children is higher than ever, the percentage of the population they represent is not, in 1910 this group made up 35 percent of the population when compared to 20 percent in 2000.

A. population when compared to 20 percent in 2000

B. population as compared to 2000, when it was 20 percent

C. population, comparing it with 20 percent in 2000

D. population, unlike 2000, with 20 percent

E. population, compared with 20 percent in 2000

31. A recent review of pay scales indicates that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times in 1980.

1. that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times

2. that, on average, CEO’s now earn 419 times the pay of blue-collar workers, a ratio that compares to 42 times

C. that, on average, CEO’s now earn 419 times the pay of blue-collar workers, as compared to 42 times their pay, the ratio

3. CEO’s who now earn on average 419 times more pay than blue-collar workers, as compared to 42 times their pay, the ratio

4. CEO’s now earning an average of 419 times the pay of blue-collar workers, compared to the ratio of 42 times

在这两题中,非正确选项各有不同的错误, 都还好区分.

我的问题是, “as compared to…” 中as 是什么词性或起什么作用呢? 在这种语境中, 什么时候需要加或可以加 as?

as compared to与compared with在用法或含义上有不同吗?

(在11版OG中, compare to 和compare  with 的区别似乎已淡化近零)

Thanks.

静候NN!!

静候NN!!