Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows. Medical authorities expre

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问题        Smoking, which may be a pleasure for some people, is a serious source of discomfort for their fellows. Medical authorities express their【C1】____________about the effect of smoking on the health not only【C2】___________those who smoke but also of those who do not. In fact, nonsmokers who must involuntarily inhale the air polluted by the tobacco smoke may【C3】___________more than the smokers themselves.
       As you are doubtless aware, a considerable number of our students have【C4】___________an effort to【C5】___________the university to ban smoking in the classrooms. I believe they are entirely right in their aim.【C6】___________, I would hope that it is possible to achieve this by【C7】___________on the smokers to use good judgment and show concern for others rather than【C8】___________regulation.
       Smoking is prohibited by city laws in theaters and in halls used for showing films as well as in laboratories【C9】___________there may be a fire hazard. Elsewhere, it is up to your good sense.
       I am therefore asking you to maintain "No Smoking" in the auditoriums and classrooms. This will prove that you have to keep nonsmokers’ health and well - being【C10】___________, which is very important to a large number of our students.
【C9】

选项 A、which
B、when
C、where
D、in

答案C

解析 因为空格后面是定语从句,而且先行词“in laboratories”是一个表示地点的状语,故选C。
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