Question

Human facial expressions differ from those of animals in the degree ___ they can be controlled on purpose.

A.with which                                            B.to which

C.of which                                               D.for which

Answer 1

B

解析:

to which引導(dǎo)定語從句；which指代先行詞animals,表示“對它們來說”；with which 意為“和……在一起”；of which 意為“其中”；for which 意為“為了”。