地震的直接灾害是（）
A.房屋倒塌
B.瘟疫
C.火灾、水灾
D.工业爆炸
参考答案：A
The children went home from the grammar school,their lessons___for the day.
A．finishing
B．finished
C．had finished
D．were finished
与1g氢气完全反应的氧气的质量为[ ]
A．0.5 g
B．1 g
C．8 g
D．16 g
