Zoologists hope to learn whether minor variations in the migration routes of cer

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问题 Zoologists hope to learn whether minor variations in the migration routes of certain animals are intentional or merely______.

选项 A、willful
B、legendary
C、accidental
D、unbelievable

答案 C

解析形容词词义辨析。由句中的whether…or引导对比关系，空格填入的词应与intentional(特意的)的意思相反。选项中，accidental(偶然的)符合要求。故答案为C。

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