[求助]immune-system不知道题好,谢谢大家帮忙

A researcher discovered that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.

The researcher's conclusion depends on which of the following assumptions?

A ) high immune-system activity protects against mental illness better than normal immune-systme activity does.

B) mental illness is similar to physical disease in its effects on body systems

C) people with high immune-system activity cannot develop mental illnesss.

D) mental illness does not cause people's immune-system activity to decrease.

E) psyhological treatment of mental illnesss is not as effective as is medical treatment.

answer: D, I chose A

这道题我也做错了，是OG的第25题。有没有人可以讲解一下啊？

D) mental illness does not cause people's immune-system activity to decrease.

This is the obvious answer.  I -> -M .  However, if D were to be true, then

M -> -I  

Then what is claimed: 'The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.'   is false.  

Because then bad immune system occurs after mental illness, and is caused by mental illness.  In other words, everyone can have good immune system, until they get mental illness, then immediately, their immune system goes down.  

我得理解：（我第一次解答，不知道这里的法则，希望指教）

首先这是一个假设题，假设题首选NOT +WEAKEN 型

另外  The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.  研究员的结论是说：免疫系统保护physical disease  和mental illness  一样好

A ) high immune-system activity protects against mental illness better than normal immune-systme activity does.

说得是 高免疫系统 保护 精神病 比低免疫系统好  ，这能说明什么问题呢？ 谁告诉我们高的比正常的好 －－－》他们免疫系统保护physical disease  和mental illness  一样好那？？？ 如果高的和正常的效果一样但是，他们都没用那？？？

这好像犯了外推性错误，记得我上XDF 的时候 绿皮书上有个 安全带 死亡的题 ，差不多意思，那道题里 有轻伤－－－》重伤   也有外推性的错误，我问狒狒的时候，他说： 因为这里边有个常识，在受伤的人中，不是轻伤就是重伤

所以才能外推，否则，就错了

不知道回答的怎么样，请指教