21. What is the main idea of the article?
(A) Coffee should be avoided by everyone.
(B) Coffee is harmful and causes many diseases.
(C) Coffee may be healthier than many people think.
(D) Coffee is only good for adults.
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統計: A(2), B(8), C(58), D(2), E(0) #3588112
統計: A(2), B(8), C(58), D(2), E(0) #3588112