①发挥主观能动性是改善空气质量的依据
②人工影响天气的活动是有意识有目的的
③发挥主观能动性是尊重客观规律的前提
④必须根据规律发生作用的条件利用规律
A:①②
B:②④
C:①③
D:③④
解不等式组: {2x+5>3(x−1)4x>x+72
--- is it from here to Australia?
--- I'm not sure, but I know it's on the other side of the earth.