Eighteen states have enacted laws to regulate activities in wetlands.A.YB.NC.NG
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Eighteen states have enacted laws to regulate activities in wetlands.
A.Y
B.N
C.NG
更新中~-
正确答案:C
解析:文章在“How are wetlands protected?”一段中指出“Beyond the federal level,a number of states have enacted laws to regulate activities in wetlands”:“除政府之外,有一些州也紧跟其后,他们颁布法令以规范湿地中的活动”。文中只用了a number of(若干,一些),并没有提到确切数字。故答案为NG。
