A:1.04
B:1.03
C:0.95
D:0.94
已经成为我国一些大城市空气污染的主要来源的是 ( )
—Michael was late for Mr. Smith's chemistry class this morning.
—________? As far as I know, he never came late to class.
下面两幅图选自《蔡志忠漫画》,它们分别反映了战国时期诸子百家中哪一学派的思想主张( )
下列哪项不是种子萌发所必需的( )