[问答题]
1.Outline how treading on a drawing pin can b ja 1liqn,ab)2z 3/ruhring about th3xje:coe j y27kiz /r0e reflex of lifting the f0xy73r /j :c2oejikezoot.
2.Describe how the cerebellum exerts overall control over the voluntary movements of the body.
3.Explain how melatonin plays a part in the control of circadian rhythms.
