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

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

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

答案A

解析 delicate的意思是“易碎的,纤弱的”,如Although the coral looks hard,it is very delicate.(珊瑚虽然看起来很坚硬,其实是非常易碎的。)fragile“脆弱的”,delicate与fragile意思相近。expansive“扩展的”;complex“复杂的”;unusual“不寻常的”。故选A。
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