在地球表面上分布的三个圈层是[ ]
A．大气圈、水圈、岩石圈
B．云圈、空气圈、植物圈
C．氧气圈、二氧化碳圈、水圈
D．大气圈、动物圈、水圈
答案：A
无盖圆柱形油桶，底面半径20厘米，高50厘米．
（1）做这个油桶至少需铁皮多少平方分米？（得数保留整十平方分米）
（2）每立方分米可装汽油0.75千克，这个油桶能汽油多少千克？
— I am shocked at the news that many pupils were killed in the terrible traffic accident.
— So am I. Little the safety of the poor children. [ ]
A. did the local government care for
B. the local government cared for
C. did the local government care about
D. the local government cared about
