In this experiment the famous professor showed three different to the study of physicsA.

问题补充：

In this experiment, the famous professor showed three different to the study of physics．

A. means

B. methods

C. ways

D. approaches

答案：

A. means

B. methods

C. ways

(答案→)D. approaches

解析：（四个选项都有“方法”的意思，但从搭配上看，后面有介词to，所以答案选D。）