From this passage, we learn that aspirin is usually used to treat _______. Researchers have studied the connection between aspi

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问题 From this passage, we learn that aspirin is usually used to treat _______.
Researchers have studied the connection between aspirin and heart disease for _______.

选项 A、more than a century
B、more than ten years
C、more than one year
D、a few years

答案B

解析 第四段第一句意为:美国研究人员在19世纪80年代初就开始了对阿司匹林的专门研究。故本题答案为B。
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