The notion that a parasite can alter the behavior of a host organism is not mere fiction; indeed, the phenomenon is not even ___

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问题 The notion that a parasite can alter the behavior of a host organism is not mere fiction; indeed, the phenomenon is not even ______.

选项 A、observable
B、real
C、comprehended
D、rare

答案D

解析 “indeed”表明前后句要表达一个意思,“not rare”与“not fiction”表达的意思相似。
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