2. 外语
  3. Medical statistics have shown that the widespread use of cigarettes ______to the increase of cancers.

Medical statistics have shown that the widespread use of cigarettes ______to the increase of cancers.

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问题 Medical statistics have shown that the widespread use of cigarettes ______to the increase of cancers.
选项 A、refers
B、confines
C、owes
D、contributes
答案D
解析 本题考查动词短语的含义。A参考，指的是；B限于；C归功于；D有助于，起作用。该句的大意为：医学研究表明人们普遍吸烟导致癌症患者人数增加。
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