.

—___________ is the population of the United States?

—I don’t know exactly, but I’m sure that it has __________ population than China.

A．How much; much less

B．How many; fewer

C．What; much less

D．What; a much smaller

患者，女，49岁。因"尿毒症"行肾移植，术后第4天患者出现低热，尿量逐渐减少，自觉切口胀痛，乏力，查体发现移植肾肿大。

患者最可能发生的并发症是（）。

A.慢性排异

B.急性排异

C.切口感染

D.肾积水

E.超急性排异