.

—___________ 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

三十二岁初产妇，孕7周时超声提示双胎妊娠，孕19周外院诊断羊水过多由乡镇医院转入。查体：子宫张力高，宫底达36cm，孕妇不能平卧，两胎儿胎心好。

如果早孕期超声提示单绒毛膜双羊膜囊双胎，该病例最可能诊断为（）

A.胎儿畸形

B.双胎输血综合征

C.选择性生长受限

D.单绒毛膜双单羊膜囊双胎

E.镜像综合征