女，32岁，月经规律，结婚3年不孕，渴望妊娠，停经50天，无诱因 * * 出血1天，少于月经量，无腹痛。

1周后复查B超胎心消失， * * 出血量增多，最恰当的诊断是（）

A.习惯性流产

B.难免流产

C.不全流产

D.流产感染

E.完全感染

F.异位妊娠

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

Hip dysplasia is more common among German shepherds than dogs of other breeds.（）

A. than

B. than is so of

C. compared to

D. in comparison with

E. than among