单选题But the fragile ecosystem could be hurt by a plan to dredge more than 23 miles of river at the delta’s southern end.Aflimsy Boptical Cmarginal Dvacant
单选题
But the fragile ecosystem could be hurt by a plan to dredge more than 23 miles of river at the delta’s southern end.
A
flimsy
B
optical
C
marginal
D
vacant
参考解析
解析：
句意：在三角洲最南部挖掘23英里长的河流可能会破坏脆弱的生态系统。fragile脆弱的。flimsy与之同义。optical视力的。marginal边缘的。vacant空的，空缺的。
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