a.traffic accidents
b.smoking-related desease
c.murder
d.all of these
2.Every day there are over_____high school strdents who will become regular smoker.
a.75 b.23 c.30 d.3000
3.By dropout the author means______.
a.students who failed the examination
b.students who left school
c.students who lost their way
d.students who were driven out of school
4.The reason for declining adolescent smoking is that ________.
a.NCI has taken effective measures
b.smoking is prevented among high school seniors
c.there are many smokers who have died of cancer
d.none of these
5.What is implied but not stated by the author is that ________.
a.smoking rates among youth have declined very little
b.there are now more female than male smokers among high school seniors
c.high smoking rates are due to the incease in wealth
d.smoking at high school are from low socio-economic backgrounds
答案:bdbdb
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