But the fragileecosystem could be hurt by a plan to dredge more than 23 miles of river at the delta’s southern end.

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问题 But the fragileecosystem could be hurt by a plan to dredge more than 23 miles of river at the delta’s southern end.

选项 A、flimsy
B、optical
C、marginal
D、vacant

答案A

解析 句意:在三角洲最南部计划挖掘23多英里长的河流,可能会破坏脆弱的生态系统。fragile(脆弱的);flimsy(与fragile同义);optical(视力的);marginal(边缘的);vacant(空的,空缺的)。
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