下列大洲中,所包含的发达国家个数最多的是( )
A.亚洲
B.欧洲
C.大洋洲
D.北美洲
经济发展水平高的国家被称为发达国家.欧洲经济水平据各大洲首位,拥有发达国家数量最多.
故选:B.
采矿厂开采铁矿石x吨,采煤的重量比铁矿石的3倍少5吨,采煤______吨.当x=139.8时,采煤多少吨?
________ is announced in today's paper, they have succeeded in solving many problems in
accordance with the new theory. [ ]
A. It
B. That
C. What
D. As