患者，女，28岁，已婚。妊娠后 * * 少量出血，伴小腹隐痛，腰酸，恶心纳差，舌苔白，脉细滑。B超检查示宫内可见胎囊。应首先考虑的是（）。

A.难免流产

B.先兆流产

C.习惯性流产

D.稽留流产

E.不全流产

My neighbour has a good gardener. The height of the tree in his garden is almost ______ the one in mine. [ ]

A. twice than

B. twice of

C. twice that of

D. twice