题目：
In this passage, a quack or a charlatan is someone who ______.
A．has a special ability
B．has little knowledge
C．is not a good doctor
D．pretends to be a doctor
答案：
参考答案：D
解析：[分析] 词义题型。 根据第一句话中的破折号后的解释...quacks and charlatans—disreputable women and men with little or no medical knowledge who promise quick cures at cheap prices．(庸医和骗子是指那些本身缺乏医学知识却又许诺能又快又省地治好病的臭名昭著的人)可以推断出正确答案。quack“庸医”。
