2. 外语
  3. In the 1950’s accumulating scientific evidence linking cigarette smoking and lung cancer made a(51)impact(52)the smoking public.

In the 1950’s accumulating scientific evidence linking cigarette smoking and lung cancer made a(51)impact(52)the smoking public.

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问题 In the 1950’s accumulating scientific evidence linking cigarette smoking and lung cancer made a(51)impact(52)the smoking public. During this period many health agencies declared smoking to be a(53)Hazard. US Surgeon General Leroy E. Brunei said in 1957: "The weigh of the evidence is increasingly pointing to one direction: that(54)smoking is one of the causative factors in lung cancer." The initial reports had the heaviest impact, so(55)total cigarette production dropped in 1953 and again in 1954.(56)reports appeared to have less(57)on smoking habits, and by 1957 cigarette production had (58)above the 1952 level.
(59)four voluntary health organizations urgued president John F. Kennedy to(60)a commission to study the widespread implications of the tobacco problem, the Surgeon General’s Advisory Committee on Smoking and Health was(61)in 1962 to review and evaluate all(62)scientific data. When its report, Smoking and Health, was released in early 1964, cigarette consumption again declined(63). Pipe and cigar smoking increased. More than 350, 000 copies of the report were contributed and sold.(64)abstracts and pamphlets were prepared  by the Public Health Service and other organizations(65)a massive educational  campaign on the hazards of cigarette smoking.
选项 A、After
B、Although
C、Before
D、If
答案A
解析 分析上下文，after引导时间状语从句。
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