大全SECTION10-12和18请问?

12.   A study comparing a group of chronically depressed individuals with an otherwise matched group of individuals free from depression found significantly more disorders of the immune system among the depressed group. According to the researchers, these results strongly support the hypothesis that mental states influence the body’s vulnerability to infection.

Which of the following, if true, casts the most serious doubt on the researchers’ interpretation of their findings?

(A) The researchers’ view does little more than echo a familiar theme in folklore and literature.

(B) Chronically depressed individuals are no less careful than others to avoid exposure to infections.

(C) Disorders of the immune system cause many of those individuals who have them to become chronically depressed.

(D) Individuals who have previously been free from depression can become depressed quite suddenly.（C）

(E) A high frequency of infections can stem from an unusually high level of exposure rather than from any disorder of the immune system.

什么意思啊?我觉得答案C象加强多点,怎么回是答案?

18.   There are fundamentally two possible changes in an economy that will each cause inflation unless other compensating changes also occur. These changes are either reductions in the supply of goods and services or increases in demand. In a prebanking economy the quantity of money available, and hence the level of demand, is equivalent to the quantity of gold available.

If the statements above are true, then it is also true that in a prebanking economy

(A) any inflation is the result of reductions in the supply of goods and services

(B) if other factors in the economy are unchanged, increasing the quantity of gold available will lead to inflation

(C) if there is a reduction in the quantity of gold available, then, other things being equal, inflation must result

(D) the quantity of goods and services purchasable by a given amount of gold is constant（B）

(E) whatever changes in demand occur, there will be compensating changes in the supply of goods and services

为什么C不对?条件说的是DEMAND increase 啊,但是B说quantity,跟supply差不多,应该是reduction才对,C正好.

不懂为什么B是答案!

第12题:提供的答案提出实际情况应该是题干中的因其实是果,而题干中的果其实是因;

第18题我也选错了,有谁指导一记,谢谢了!

增加quantity of gold 中文意思是增加金的数量,那不就是supply吗?怎么是demand呢?