2019年mpacc考试英语真题——介词和介词短语2238

{01} I’m writing this letter ________ my mother, who wants to thank you for your nice gift.

A.in order to	B.in behalf of
C.on behalf of	D.in terms of

解析：词义辨析题。A. in order to 为了   C. on behalf of 代表  D. in terms of 从…角度 句意：我代表妈妈给你写信，妈妈感谢你的礼物。 根据语境选C
本题选C。
{02}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

解析：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。
本题选C。