【单选题】Teens aren ’ t Getting Enough Sleep Most teens need about 8 to more than 9 hours of sleep each night . The right amount of sleep is essential ( necessary ) for anyone who wants to do well in test s or...
A.
. To explain the reasons why teens are lack of sleep .
B.
. To draw people ’ s attention to teens ’ sleeping problem .
C.
. To introduce that we have the problem of sleep shortage .
D.
. To give teens advice on possible ways of having better sleep .
【简答题】It is worrying that nowadays more and more agers have free access to the Internet. Ideas for reference: T he Internet is a virtual world of unpleasant stuff of all kinds . T eenagers are vulnerabl...