关于作用力与反作用力,下列说法中正确的有( )
A:物体相互作用时,先有作用力,后有反作用力
B:作用力与反作用力大小相等,方向相反,作用在同一直线上,故这两个力合力为零
C:作用力与反作用力可以是不同性质的力,例如作用力是弹力,其反作用力可能是摩擦力
D:作用力和反作用力总是同时分别作用在相互作用的两个物体上
下列事例不能作为地球是球形证据的是( )
A: Hello, Wang Jun. ____ didn't you go to school yesterday?
B: Because I was ill and went ____ the hospital.
A: ____ did the doctor say?
B: He asked me to drink more water.
A: Oh. How are you now?
B: I'm well now. ____ you.
A: That's OK. I'm going to the zoo this afternoon.
B: Really? Can I go ____ you?
A: OK.