党的十七大报告提出“要增强发展协调性，努力实现经济又好又快发展”。下面做法符合这一要求的是（　　）

①淘汰落后产能，实施节能减排　②优化产业结构，促进经济发展方式的转变　③提高自主创新能力，建设创新型国家　④把提高经济增长速度放在工作的首位

A．①②③

B．①②④

C．①③④

D．①②③④

(2013·陕西师大附中模拟)If we had taken such effective measures much earlier, the river ________ so seriously now.

A．is not polluted

B．would not be polluted

C．had not been polluted

D．would not have been polluted