What.s the author.s opinion in part one?
（2.0分）
2.0 分

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