52．The first paragraph is intended to___________.
　　[A]suggest that self-medication has a long history
　　[B]define what diagnosis means exactly
　　[C]praise doctors for their expertise
　　[D]tell the symptoms from the causes
　　53. Advertisements are aimed at people suffering from mild complaints because_______．
　　[A]they of ten watch ads on TV
　　[B]they are more likely to buy the drugs advertised
　　[C]they generally lead a sedentary life
　　[D]they don’t take to sports and easily catch colds
　　54．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
　　55．The author tells us in paragraph 4________.
　　[A]the reasons for keeping medicines at home
　　[B]people’s doubt about taking drugs
　　[C]what kind of medicine people should prepare at home
　　[D]the possible harms self-medication may do to people
　　56．The best title for the passage would be_______.
　　[A]Medical Practice
　　[B]Clever Advertising
　　[C]Self-Medication
　　[D]Self-Treatment