Forests are delicate systems that if disturbed can be permanently destroyed.A、ex

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问题 Forests are delicate systems that if disturbed can be permanently destroyed.

选项 A、expansive
B、complex
C、unusual
D、fragile

答案 D

解析形容词词义辨析。根据句中destroyed判断，森林是很“脆弱的”，与选项中的fragile(脆弱的，易碎的)为同意表达。故答案为D。

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