—The plane is due to take off at 7：50 from the airport.

—________ we fail to arrive there on time?

—Try to take another flight then.

A．What if

B．As if

C．Even if

D．Only if

子宫内膜癌最主要的临床表现为（）

A.下腹及腰骶部疼痛

B.贫血、消瘦、恶病质

C.不规则 * * 出血

D.下腹部包块

E.白带多伴瘙痒