题干
A: What do you usually do after school , David ?
B: ____ How about you , Jenny ?
A: I usually do my homework . ____
B: What sport do you usually play ?
A: ____
B: I don’t like basketball . My favorite sport is tennis , and I often play tennis .
A: ____
B: No , I can't . ____ He often plays volleyball with his friends
| I usually draw pictures . I like playing basketball . But my brother can . I can't play basketball . Can you play volleyball ? But sometimes , I play sports with my brother . |
答案(点此获取答案解析）
A,F,B,E,C
)经分析发现无论怎样混合，气体中仅含的C、O两种元素的质量比总小于3∶8，若混合气体中C、O质量比为1∶8，则A、B两气体的体积比可能为（ ）