下列说法中正确反映发展的实质是

①发展就是事物的运动和变化 ②发展是事物的前进和上升

③发展具有普遍性 ④发展是新事物的产生和旧事物的灭亡

A．①②

B．③④

C．①③

D．②④

The Internet is a wonderful discovery, _____ of great significance to people's lives. [ ]

A. as is I think

B. which I think it is

C. as I think

D. which I think is