做题练习 P35-P50

错题记录

Personnel officer: The exorbitant cost of our health-insurance benefits reflects the high

dollar amount of medical expenses incurred by our employees. Employees who are out

of shape, as a group, have higher doctor bills and longer hospital stays than do their

colleagues who are fit. Therefore, since we must reduce our health-insurance costs, we

should offer a rigorous fitness program of jogging and weight lifting to all employees, and

require employees who are out of shape to participate.

Which of the following, if true, provides the most support for the personnel officer's proposal?

(A) The medical expenses incurred by fit people who participate in a program of jogging

and weight lifting are less than those incurred by fit people who do not participate in

such a program.

这题的加强方式是指出方案蕴含的其他事件没有来带副作用，这个点我做题的时候没有考虑到。方案蕴含AB两个事件，我只考虑到怎么加强A，却没有想到B不带来副作用也是一种加强的方法。