在CT图像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.颌下后静脉
参考答案：E
Plastic bags and boxes________ "white pollution" are attracting more and more people's attention. [ ]
A. are known as
B. are known for
C. known as
D. known for
This is ________ English book and that is ________ Chinese book.[ ]
A. a; an
B. an; a
C. the; an
D. an; the
