一间10米2大小的房间内空气的质量大约是（ρ空气=1.29千克/米3）[ ]
A．1.0千克
B．10千克
C．30千克
D．300千克
答案：C
— Who ____________ to clean the blackboard ____________ afternoon?
— The students of Team Two are.[ ]
A. going; this
B. are going; before
C. want; this
D. would like; in the
别人常常说我莽撞。
A．是
B．否
