2. 外语
  3. Circulatory systems on organisms originated in widely separated epochs, according to the fossil record, and under a broad range

Circulatory systems on organisms originated in widely separated epochs, according to the fossil record, and under a broad range

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问题 Circulatory systems on organisms originated in widely separated epochs, according to the fossil record, and under a broad range of circumstances, the myriad forms they take attest to that________of origin.
A. mysteriousness
B. randomness
C. ambiguity
D. heterogeneity
E. indeterminacy
F. diversity
选项
答案D,F
解析 空格要填入一个表示origin(起源)特征的名词，空格前面出现了指示代词that(那个)，说明此处内容是前文中提到过的。通读句子，显然originated in widely separated epochs即是that________ of origin的同义对应部分，所以空格填入与in widely separated epochs(在时期上间隔得很远)这个概念相关的词。如果时间轴上的两件事情挨得特别近，我们会认为这两件事情发生在同一时期；如果两件事情发生时间隔得特别远，我们会认为这两件事情属于不同的时期，所以空格填入表示“不同的”这一概念的词，选D项heterogeneity，F项diversity(不同，多样)。
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