Paragraphs 2 and 3 explain ________.
A. those good things are not without side effects
B. why clever advertising is so powerful
C. why in modern times self-medication is still practised
D. why people develop faulty ways of life
DCS操作画面中,M对N表示自动,对UTO表示手动（）
One reason why colleges increase tuition and fees is that the state support is shrinking.（）
Nearly all the families can manage to meet the soaring tuition costs through various investment plans.（）
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