请教大全上的几道题

SECTION 20

6.     Because paper of all kinds is the biggest single component of municipal trash, many municipalities have tried recycling to reduce the cost of trash disposal.

(A) Because paper of all kinds is the biggest single component of municipal trash, many municipalities have tried recycling to reduce the cost of trash disposal.

(B) Because paper of all kinds is the biggest single component in municipal trash, many municipalities tried to recycle so that the cost of trash disposal is reduced.

(C) Because paper of all kinds are the biggest single components in municipal trash, many municipalities have tried to recycle to reduce the cost of trash disposal.

(D) All kinds of paper are the biggest single components of municipal trash, and so many municipalities have tried recycling to reduce the cost of trash disposal.（重心）（A）

(E) All kinds of paper is the biggest single component of municipal trash, so many municipalities have tried to recycle so that the cost of trash disposal could be reduced.

All kinds of paper 用复述  paper of all kinds用单数，我还是有点不确定

SECTION20

7.     Research during the past several decades on the nature of language and the processes that produce and make it understandable has revealed great complexity instead of underlying simplicity.

(A) that produce and make it understandable has revealed great complexity instead of underlying simplicity

(B) of producing and understanding it have revealed not underlying simplicity but great complexity

(C) by which it is produced and understood has revealed not underlying simplicity but great complexity

(D) by which it is produced and understood have revealed great complexity rather than underlying simplicity（A）

(E) by which one produces and understands it have revealed great complexity instead of underlying simplicity

虽然选对了，对为什么选（A）还是不太清楚该句的句意理解得不透彻.

SECTION B

8.     One pervasive theory explains the introduction of breakfast cereals in the early 1900s as a result of the growing number of automobiles, which led to a decline in horse ownership and a subsequent grain glut; by persuading people to eat what had previously been horse feed, market equilibrium was restored.

(A) by persuading people to eat what had previously been horse feed, market equilibrium was restored

(B) persuading people to eat what had previously been horse feed restored market equilibrium

(C) by persuading people to eat what had previously been horse feed, it restored market equilibrium

(D) the persuasion of people to eat what had previously been horse feed restored market equilibrium（B）

(E) market equilibrium was restored when people were persuaded to eat former horse feed

最后一个答案为什么不对？

因为平时上网不太方便故问德较多,请见谅

6.  Explaination:

all kinds of paper 的中心词是 kinds， 所以用复数动词

paper of all kinds 的中心词是  paper，所以用单数动词

In conclusion:   在 A of B 结构中，A 是中心词

In addition: you should seperate questions in three different posts. Be aware.

7.  rocess of Elimination

Subject: Research 单数， 谓语是单数has才对。

(B)(D)(E) ... have ...  错

(AC) Research during the past several decades on the nature of language and the processes that produce and make it understandable has revealed great complexity instead of underlying simplicity.

1. Research has reaveld great complexity instead of underlying simplicity.

2. Research has been conducted in the past several decades.

3. Research on the nature of language and the process.

4. process that produce and make the language understandable.

将 C 中的 by 还原，process which produce and make it understandable by 还缺宾语，by whom?

所以：A 对

8.

1. (E) 的表达嫌疑：E 说    market equlibrium 达到 when .... 而原文并没有 when... 的隐义。

2. E 是被动语态