求教GMAT逻辑大全Test6-17

adasuying2004

Questions 16-17 are based on the following.
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.
大全-6-17.    The researcher’s conclusion would be most seriously weakened if it were true that
(A) there was a one-year delay between the completion of a pilot study for the experiment and the initiation of the experiment itself
(B) people’s levels of immune-system activity are not affected by their use of medications
(C) a few people with high immune-system activity had scores on the test of mental health that were similar to the scores of people who had normal immune-system activity
(D) people who have low immune-system activity tend to contract more viral infections than do people with normal or high immune-system activity
(E) high levels of stress first cause mental illness and then cause decreased immune-system activity in normal individuals
答案选E,没有头绪啊

SamuelGMAT

E冒似是说明颠倒因果

aomeisoft7

对
The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.
因为有immune system，所以没有病

E选项是，先有病，病损害了免疫系统。不同于：因为没有免疫系统，所以有病