8．聽下面一段獨白，回答第17至第20四個小題．
17．What's the discovery about hobbies？
A．They are profitable and fun．B．They are restful．C．They are tiring．
18．Which hobbies may become occupations according to the passage？
A．Painting and playing football．
B．Writing and taking photographs．
C．Writing and swimming．
19．What's the effect of hobbies in the doctors'opinion？
A．Help people choose jobs．
B．Make people busy with life．
C．Make people's lives more enjoyable．
20．What should people sitting all day at desks do？
A．Do some sports．
B．Raise some fish or flowers．
C．Collect stamps or bottles．
