It is commonly accepted in American society that too much sleep is______.

A．ware us of the wickedness of napping
B．explain the danger of sleepiness
C．discuss the side effects of napping
D．convince the reader of the necessity of napping

A．preferable to have a sound sleep before a night shift
B．good practice to eat something light before we go to bed
C．essential to make up for cost sleep
D．natural to take a nap whenever we Teel the need for it