What is the main idea of the first paragraph？
A. People over 30 play the leading role in society because of their maturity and experience.
B. The generation gap between the young and the old in the US has become even greater today.
C. American society is shifting from being youth-centered to older-people-centered.
Don't trust anyone under 30' is the new catchword of the American people.
【B3】
A. for
B. in
C. on
D. with
Critical readers are different from ordinary readers in that ______.
A. they are only interested in the facts provided by the article
B. they make a judgment of the arguments given in the article
C. they do not accept the arguments provided by the article.
D. they are able to distinguish between facts and opinions given in the article.
【B10】
A. some
B. many
C. others
D. those
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