How does Tom often go to school?
A:
B:
C:
当原子弹试爆成功、蘑菇云腾空而起时,美国科学家奥本·海默喃喃自语:“我们正在毁灭世界!”世界上第一个遭受核灾难的城市是( )
成语是中华文化的瑰宝.下列成语涉及化学变化的是( )
It is said that his new book consists of nine chapters.
在Rt△ABC中,∠C=90°,sinA=513,下列错误的是( )