题目内容：
【单选题】
What.s the author.s opinion in part one?
A、
Teenagers. idleness and ignorance will produce serious effect on all concerned and
for society as a whole.
B、
Teenagers. idleness and ignorance will produce positive effect on all concerned and
for society as a whole.
C、
Teenagers. idleness and ignorance won.t produce any serious effect at all.
D、
Teenagers. idleness and ignorance will produce serious effect only on
themselves.
参考答案：