Question

Lately some scientists are experimenting ___________ white mice to ____________ this kind of medicine.

A．on,try on

B．with, test on

C．on ,test out

D．with,carry out

Answer 1

C

句意：最近一些科学家正在在白鼠身上做实验来检测这种药。短语：experiment on 在什么上做实验，test out 检测，测试，所以选C。