根据《环境影响评价技术导则非污染生态影响》,需要对关键的单项问题进行替代方案比较的建设项目,其生态评价等级是()级。
A.1
B.2
C.3
D.4
参考答案:A
He has done ______ to improve his English. [ ]
A. something useful
B. anything useful
C. useful nothing
D. useful anything
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