2. 外语
  3. The science of astronomy was begun by amateurs and today remains dependent on their contributions, which are incisive by virtue

The science of astronomy was begun by amateurs and today remains dependent on their contributions, which are incisive by virtue

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问题 The science of astronomy was begun by amateurs and today remains dependent on their contributions, which are incisive by virtue of being________by the a priori assumptions that often vitiate the work of professional research scientists.
选项 A、characterized
B、unencumbered
C、supported
D、contradicted
E、inspired
答案B
解析 同义重复题。逻辑连接词是by virtue of，表示“由于”。第一句话完整，说天文学始于并依赖amateurs。逗号后面的which从句修饰their contributions，继续表述其好的方面，by virtue of进一步说明好的原因，是因为被先前的假设________，而这种假设vitiate(损害)专业工作。注意句子中的priori assumptions的意思是made before or without examination；not supported by factual study，即“未经检验的先验假设”，这种假设会影响专业工作，显然这种假设不好，所以如果要表达amateurs的好，空格需要表示“没有被这种假设影响”的含义，A、C、E都是正向词，显然不对，D也不符合句意，B项unencumbered(未受阻碍的)正确。
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