[解析]
(1)C考查细节推理,根据文章中的…said that under economic pressure American young people have to…In these circumstances,he said,young people lack confidence,…said Chinese young people are also facing economic pressure…"…说在压力之下美国年轻人不得不…他说在这些环境下年轻人缺乏自信…说中国的年轻人也面临着经济压力…"可知"中美两国的年轻人缺乏自信的原因都是因为经济压力",故本题答案为C选项.
(2)B考查细节推理,根据原文的…which was not the case in the 1960s when young people thought themselves capable of doing anything.这与20世纪60年代(美国的)年轻人认为他们能做任何事情的情况不一样.可知"那时候年轻人十分自信",故本题答案为B选项.
(3)B考查主旨大意,本文主要讲的是中美两国的年轻人所面临的问题及其解决方法,故本题答案为B选项.