2. 外语
  3. The 17 th century English physician William Harvey discovered the _______ of the blood.

The 17 th century English physician William Harvey discovered the _______ of the blood.

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问题 The 17 th century English physician William Harvey discovered the _______ of the blood.
选项 A、circulation
B、Circus
C、circumstance
D、circuit
答案A
解析 形近易混词辨析。circulation意为“循环，流通”，如：stimulate the circulation of blood(促进血液循环)；circus意为“马戏团，杂技团”；circumstance意为“环境，情况”，如：Maybe under these circumstances we may say that man can conquer nature．(也许在这样的情况下我们可以说人定胜天。)circuit意为“电路”，如：integrated circuit(集成电路)。根据题意，应选A)。
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