Smoking, which may be a pleasure for
some people, is a serious source of discomfort for their fellows. Medical
authorities express their{{U}} (31) {{/U}}about the effect of smoking on
the health not only{{U}} (32) {{/U}}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{{U}} (33) {{/U}}more than the smokers
themselves. As you are doubtless aware, a considerable number of
our students have{{U}} (34) {{/U}}an effort to{{U}} (35)
{{/U}}the university to ban smoking in the classrooms. I believe they are
entirely right in their aim.{{U}} (36) {{/U}}, I would hope that it is
possible to achieve this by{{U}} (37) {{/U}}on the smokers to use good
judgment and show concern for others rather than{{U}} (38)
{{/U}}regulation. Smoking is prohibited by city laws in
theaters and in halls used for showing films as well as in laboratories{{U}}
(39) {{/U}}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{{U}} (40) {{/U}}, which is very
important to a large number of our students.
【正确答案】
A
【答案解析】[解析] 该空应填入一个可以与about连用的名词。根据上下文，concern在词义上最为合适，而且concern about sth．/sb．意思是“对某事或某人的担心”。这句话的意思是说“吸烟影响了吸烟者本人及不吸烟者的健康，医学界权威对此表示担心”。
【正确答案】
D
【答案解析】[解析] not only．．．but also应该连接两个并列成分，既然后面出现了of those who do not，那么前面应该是of those who smoke，意思是吸烟既影响了吸烟者的健康，又影响了不吸烟者的健康。
【正确答案】
B
【答案解析】[解析] 四个选项词义都很相近，又有所不同，endure意为“忍耐”，suffer意为“遭受痛苦，受损害”，undergo意为“经历，经受不愉快的或痛苦的事物”，put up with意为“忍受或容忍、”。根据上下文，suffer一词最为合适。该句意思是“事实上，与吸烟者相比，那些被迫吸入受到香烟污染的空气的不吸烟者将遭受更多的痛苦”。
【正确答案】
C
【答案解析】[解析] join意思是“成为……的一员”，join in sth．意思是“加入某活动中，一起做某事”，从上下文的意思看，C项join in更为合适。本题的四个选项提示考生应填一个动词， direct sb.to do sth．为“指示，命令某人做某事”，而directs sb.to do sth。放在文中不仅意思不对，而且用法也不对，因此B项是错的。directs sb．at sth．为“使……转向或对准某一方向”，而D项中direct与at连在一起，中间没有宾语，在意思及用法上均不对。
【答案解析】[解析] 四个选项都是动名词，都可以做介词by的宾语。call on sb to do．sth．意为“恳求或促使某人做某事”，plead with sb. for sth．意为“再三恳求或请求某人做某事”，beg sb. for sth，意为“祈求某人做某事”，insist on sth．/doing sth．意为“坚决主张(或做)某事”。由此看来，选项D意思与上下文相符，而且只有call一词在用法上符合原文。
【正确答案】
B
【答案解析】[解析] rather than前后通常连接两个并列成分。从上下文意思看，by calling on the smokers to use good judgement and show concern for others与rather than后面的成分是并列的，因此，此处应该填入介词by。