Though science is often imagined as a disinterested subject, scientists are no different from anyone else: they are ______ human beings enmeshed (陷入:卷入) in a web of personal and social circumstances.
A. vulnerable B. rational C. careless D. passionate

一年到头发情，但非繁殖季节的性周期不排卵的动物是（）

A、兔

B、狗

C、猫

D、猴