Which is WRONG about cervix?（ ）
选项：

A:The cervix is a tubular structure that serves as the conduit between the endometrial cavity and the vagina.;
B:In postmenopausal women, the cervix may appear flush with the vagina on examination rather than protruding.;
C:The cervical canal opens into the endometrial cavity at the external os and into the vagina at the internal os. ;
D:The posterior aspect of the cervix forms part of the anterior boundary of the pelvic posterior cul-de-sac.;
E:The endocervical canal is lined with glandular epithelium.