单项选择题

We can infer from the last paragraph that ______.

A．smokers should not expect to become airline pilots
B．smoking in emergency cases causes mental illness
C．no airline pilots smoke during flights
D．smokers may prove unequal to handling emergency cases

<上一题目录下一题>

热门试题

单项选择题

The purpose of George Spilicb' s experiments is ______.

A．to test whether smoking has a positive effect on the mental capacity of smokers
B．to show how smoking damages people' s mental capacity
C．to prove the smoking affects people' s regular performance
D．to find out whether smoking helps people' s short-term memory

单项选择题

Which of the following statement is true

A．Active smokers in general performed better than deprived smokers.
B．Active smokers responded more quickly than the other subjects.
C．Non-smokers were not better than other subjects in performing simple tests.
D．Deprived smokers gave the slowest responses to the various tasks.