下列各组物质分别在空气中充分燃烧,产物完全相同的是( )
A:H2和CO
B:CH4和CO
C:C2H5OH和CH4
D:H2和C
①陈独秀 ②李大钊 ③鲁迅 ④胡适 ⑤***
地球表面海洋与陆地面积之比是( )
- Is he your ____ (brother/sister)?
- Yes. He's my brother. He's ____ (young/old).