二十八岁经产妇，妊娠37周， * * 无痛性多量流血5小时入院。查血压80/60mmHg，脉搏102次／分。无宫缩，宫底在剑突下2指，臀先露，胎心率94次／分，骨盆外测量正常。预防本病的发生，最有意义的是（）

A.加强定期的产前检查

B.且避免宫腔内压力骤然降低

C.避免多次刮宫、多产、产褥感染

D.妊娠期间避免长时间仰卧和腹部外伤

E.积极防治妊娠期高血压疾病

Which one of the following is NOT RIGHT?

A. He listened carefully in every class. As a result, he got full marks in the exam.

B. He listened so carefully in every class that he got full marks in the exam.

C. He got full marks in the exam. As a result, he listened carefully in every class.