Our government has tried many ways to the smog(雾霾)problem. Maybe we'll have a clear sky in the near future.
A:put away
B:work out
C:come up
下列句子在文中的意思不正确的一项是( )
光盘银色部分是一个圆环,内圆半径是2cm,外圆半径是6cm.它的面积是多少平方厘米?
《中华人民共和国环境保护法》1983年问世。(判断对错)