在CT图象上腮腺深浅部的分界为（）。
A.颈内动脉
B.颈外动脉
C.颈内静脉
D.颈外静脉
E.颌后静脉
参考答案：E
A firewall is a (68) system designed to (69) all organization, s network against threats.
A．operating
B．programming
C．security
D．service
The he smokes, the he will be. [ ]
A. more, better
B. more, worse
C. most, worst
D. worse, more
