It's dangerous to play on the thin ice. It's not ____ to hold a person. [ ]

A. hard enough

B. enough hard

C. enough cold

D. enough thick

下列症状和体征与葡萄胎有关的是

A．妊娠高血压综合征 

B．先兆子痫 

C．子宫大于妊娠月份 

D．血HCG升高 

E．以上各项均是