Look at the man over there．He is hands at us．
A：drawing
B：washing
C：waving
D：watching
人踢球时，对球施力的物体是____ ，同时____ 也受到球的作用力，这一事例说明____ ．
The club is far from our school. Let's ________ taxi.
世界最大的淡水湖群是( )
