问题 单项选择题 A3/A4型题

初产妇王某,产钳助产分娩一女婴,体重4100g,胎儿娩出后 * * 持续出血50ml,色鲜红,检查产道发现出血口并缝合,鲜血停止,更换会阴垫。产后1小时又发现会阴垫约有出血100ml,马上测量血压80/50mmHg,面色苍白,出冷汗,子宫轮廓不清。

此时出血的原因最可能是 ()

A.胎盘剥离不全

B.胎盘残留

C.子宫收缩乏力

D.凝血功能障碍

E.软产道裂伤

答案

参考答案:C

问答题 简答题
单项选择题

Until recently, most population growth has occurred in relatively dense urban environments. In (91) words, even if we were witnessing rapid population growth, that would not mean that the (92) were filling in with people. (93) , the urban areas would tend to become more crowded. Historically, we find that people have moved to (94) the jobs were. Jobs were usually in ports or locations with many natural (95) . After transportation became relatively cheap, other geographical locations became (96) of economic activity. One factor that determines where people will move to, even when transportation becomes cheap, is (97) . And individuals working in cities (98) higher incomes than those working in (99) areas. Hence, population has tended until the 1970s to (100) in our major urban centers. Recently population has (101) out of the Northeast to the South and to the West for the more pleasant climates. If people did not (102) from living in large cities, there would likely be a much more even population distribution (103) our entire land area. Probably, if this (104) the case, there would be less concern over population (105) Indeed, one need only (106) a cross-country drive or plane trip to realize how (107) populated these United States really are. This is not to say that we should or should not do something about (108) growth. The shortage of people in certain areas merely demonstrates that overpopulation in the United States is really only a problem in (109) urban environments. And this problem may be slowly correcting (110) .

A.sparsely

B.densely

C.scarcely

D.meagerly