①所含分子数目之比为____

②所含O原子数目之比为____

③相同条件下的体积之比为____

④相同条件下的密度之比为____．

现有a、b两份质量相等的氯酸钾，其中一份加入二氧化锰，同时加热，生成气体的质量与时间关系如右图所示，下列说法不正确的是（    ）

根据句意用适当的反身代词填空

（1）Don’t worry about me. I can take care of____ (I).

（2） His name is Thomas, but he usually calls____ (he) Tom.

（3） Li Juan hurt ____  (she) when she played tennis yesterday afternoon.

（4）"You're old enough, boy. You'd better do it ____  (you).” My father said to me.

（5）Peter and Simon enjoyed ____  (they) at the English party last night.

—Will there be more people?

—__________