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

下面关于卫生桥桥体的描述中，正确的是（）

A.龈面与牙槽嵴黏膜间至少有3mm以上的间隙

B.适用于前后缺牙区牙槽嵴严重吸收的患者

C.桥体龈面应高度抛光

D.桥体龈面呈凸形

E.以上全对