1921年，芝加哥学派创始人弗兰克·奈特早期最重要的贡献是（）。

单项选择题W: Are these treatments really necessary? They don’t seem to help very much.M: I’m afraid so, Mrs. Jones. Just be patient and I’m sure you’ll see some results soon.Q: Where did this conversation most probably take place?（）

A．In a doctor's office.
B．In a professor's office.
C．In a lawyer's office.
D．In a businessman's office.

多项选择题《我们肚子里的食客》：“有时混着一二刺客如‘结核杆菌’，那就危险了”，这里运用的说明方法有（）

A.比喻
B.数据
C.诠释
D.举例
E.比较