下列有关氧气说法正确的是[ ]
A.氧气能支持燃烧,可作燃料
B.鱼能生活在水中,因为水中含有氧分子
C.氧气能跟所有物质反应
D.含有氧气的集气瓶能使带火星的木条复燃
答案:B
Only after her mother came to help her for the first few months _____ to begin her project.
A.she was allowed
B.was allowed she
C.was she allowed
D.she allowed
古罗马最重要的音乐理论家是()
A.斯特西比乌斯
B.博埃蒂乌斯
C.埃斯库罗斯
D.索福克勒斯