题目内容：
Directions：There are 2 passages in this section．Each passage is followed by some questions or unfinished statements．For each of them there are four choices marked[A]，[B]，[C]and[D]．You should decide on the best choice and mark the corresponding letter on Answer Sheet 2 with a single line through the center. Passage One
Questionsare based on the following passage．
注意：此部分试题请在答题卡2上作答。
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
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答案解析：