Because howler monkeys rarely come out of the trees in their arboreal habitat , the continued well-being of the rain forest is__

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问题 Because howler monkeys rarely come out of the trees in their arboreal habitat , the continued well-being of the rain forest is______to their survival.

选项

答案C,D

解析 逗号说明前后同义重复。空格与rarely come out of the trees in their arboreal habitat(很少踏出它们栖息的树林)同义重复。marginal不重要的,tangential不重要的,indispensable重要的,imperative重要的,expeditious迅速的,baneful有毒的。答案选CD。注:这里marginal和tangential是干扰项,同表示“不重要的”。
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