XDF的几道题目

首先SORRY一下，因为买的是盗版，所以也不知道究竟是哪的题目，希望大家来给我指点下

1.The report on gross national product-the nation's total production of goods and services-showed that second quarter inflation was somewhat lower than a previously estimation and the saving rate was slightly higher.

B) a previous estimation with a slightly higher saving rate.

E)previously estimated and that the saving rate was slightly higher.

这里我考虑的是than后面要与前面的用法一致，前面是名词，所以我选了B，结果是E，为什么哪？

2.Because young children do not organize their attetion and perceptions systematically,like adults,they may notice and remember details that the elders ignore.

B)unlike an adult

C)as adults

D)as adults do

E)as ab adult

开始我选的A，这道题正确答案是D。是不是A错在指带不明确，就像OG里面说宇航火箭装运燃料的那题？

3.It is as difficult to prevent crimes against property as those that are against a person.

B)those against a

C)it is against a

D)preventing those against a

E)it is to prevent those against a

这里我选的是B，正确答案为E   请问这种题目的比较结构怎么安排？

4.Developing nations in various parts of the world amassed in 700 billion in debts; at stake, should a significant number of these debts be
  repudiated,is the solvency of some of the world's largest  multinational banks.

E)if a significant number of debts will be repudiated,is

这里正确答案为A，请问E错在什么地方那？ 

4.Although it claims to delve into political issues,television can be superficial when each of the three major networks broadcast exactly the same satament from a polotical candidate.

C)superficial if the three major networks all

E)superficial, as when the three major networks each

这里正确答案是E，我选的C。three major networks each不是该用名词单数形式吗？而且E感觉不如C简洁。

谢谢楼上MM的解答，但我还有疑问

3.可以理解为如果第一个as后有动词的话，第二个as后必须有动词？

4.should句子不就是假设的意思吗？