[求助]请帮我解答几道语法题

1. GWD21-Q1:

According to analysts, an alliance between three major personal computer companies and most of the nation’s largest local telephone companies would enable customers to receive internet data over regular telephone lines with speeds much higher than is currently possible.

B.      with speeds that are much higher than are

C.      at much higher speeds as are

D.      at much higher speeds than that

E.       at speeds much higher than are  

为什么不是D，是因为at speeds 是搭配不能拆吗？还有，弱弱的问下，为什么是are...迷茫了很久...

 GWD1-34:

Although people in France consume fatty foods at a rate comparable to the United States, their death rates from heart disease are far lower in France.

B.      people in France and the United States consume fatty foods at about the same rate, the

C.      fatty foods are consumed by people in France at a comparable rate to the United States’s, their

D.     the rate of fatty foods consumed in France and the United States is about the same, the

E.      the rate of people consuming fatty foods is about the same in France and the United States, the

当时选了D，现在发现D丢了people.  不过还是想请教下

 GWD 2-21:GWD 4-4:GWD13-8

Although people in France consume fatty foods at a rate comparable to the United States, their death rates from heart disease are far lower in France.

B.      people in France and the United States consume fatty foods at about the same rate, the

C.      fatty foods are consumed by people in France at a comparable rate to the United States’s, their

D.     the rate of fatty foods consumed in France and the United States is about the same, the

E.      the rate of people consuming fatty foods is about the same in France and the United States, the

当时选了D，现在发现D丢了people.  不过还是想请教下

 GWD 2-21:GWD 4-4:GWD13-8

 GWD1-16

Soaring television costs accounted for more than half the spending in the presidential campaign of 1992, a greater proportion than it was in any previous election.

1. a graeter proportion than it was
2. a greater proportion than

3. a greater proportion than they have been

4. which is greater than was so

5. which is greater than it has been 

KEY:B

这里比较的对象应该是television costs spending ？（基于half——>greater proportion ）

可是总觉得a greater porprotion than in any previous election 怪怪的，为什么不放it was 呢

sc实在太差，请见谅~~如果问题很愚蠢，也辛苦耐心解答下~~

因为that指代单数 而speeds是复数