葡萄胎处理方法错误的是

A．一旦确诊，迅速清官

B．刮出物选小水泡组织送病理

C．预防感染

D．要求一次刮净官腔

E．必要时行子宫切除

Why is Las Vegas so successful in attracting tourists().

A.Because of gambling.

B.Because it is an alternative family destination.

C.Because the hotels are quite cheap.

D.Because people like the desert.