The most impressive sight in China，one of the wonders of the world，_____  the Great Wall.

A．is

B．are

C．was

D．were

关于慢性盆腔炎，下列哪些是正确的（）

A.比急性盆腔炎多见

B.可出现急性发作

C.妇科检查见附件区有压痛，增厚

D.有时不易和子宫内膜异位症相鉴别

E.常引起不孕