15.

Now lots of teenagers like smoking.It's a big problem.Some of them smoke,just for fun and some think smoking looks cool.Others smoke because there are many people around them that smoke.
As we all know,smoking is harmful,especially to students.Some teenagers even steal money so that they can buy cigarettes(烟).Besides,smoking does harm to brains and it can influence studies.Finally,it is bad for health because it can cause diseases.
Therefore(因此),we should protect ourselves from smoking.First,we should learn more about the danger of smoking.Second,we should keep away from people who smoke.
51.Now some teenagers like smoking becauseA.
A.they think it is fun
B.their parents want them to do so
C.smoking is good for them
52.From the passage,we know some teenagers steal money in order toB.
A.buy books
B.buy cigarettes
C.play games
53.Smoking is harmful toC.
A.eyes
B.legs
C.brains
54.Which of the following sentences is NOT true?C
A.Smoking can cause diseases.
B.Smoking can influence studies.
C.We shouldn't keep away from people who smoke.
55.The writer of the passage wants teenagersB.
A.to smoke
B.not to smoke
C.not to keep away from smoking.