求解，麻烦路过好心人

liuyuhang861

Industrial accidents are more common when some of the people in safety-sensitive jobs have drinking problems than when none do.  Since, even after treatment, people who have had drinking problems are somewhat more likely than other people to have drinking problems in the future, any employer trying to reduce the risk of accidents should bar anyone who has ever been treated for a drinking problem from holding a safety-sensitive job.

 

Which of the following, if true, most seriously undermines the argument above?

 

A.    Some companies place employees who are being treated for drinking problems in residential programs and allow them several weeks of paid sick leave.

B.    Many accidents in the workplace are the result of errors by employees who do not hold safety-sensitive jobs.

C.    Workers who would permanently lose their jobs if they sought treatment for a drinking problem try instead to conceal their problem and continue working for as long as possible.

D.    People who hold safety-sensitive jobs are subject to stresses that can exacerbate any personal problems they may have, including drinking problems.

E.     Some industrial accidents are caused by equipment failure rather than by em

C选项是如何起得削弱作用呢？

rnir

原题说因为酗酒的人治疗后仍会酗酒，因此避免让有酗酒史的人从事容易出事工作会降低出事几率，C说工人可以隐瞒酗酒史，这样表面看起来没有酗酒的人可能实际上是酗酒的人，起了削弱结论的作用，因为如果仅凭酗酒史进行判断而雇佣了这些人就并不能降低出事的几率，必须还有其他的判别手段。