问题
多项选择题
关于前置胎盘的病因，正确的是（）
A.吸烟、吸毒妇女为高危人群
B.瘢痕子宫妊娠后前置胎盘的发生率8倍于无瘢痕子宫
C.多次刮宫史
D.85%～90%为经产妇
E.受精卵滋养层发育与子宫内膜发育不同步
答案
参考答案：A, C, D, E
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关于前置胎盘的病因，正确的是（）
A.吸烟、吸毒妇女为高危人群
B.瘢痕子宫妊娠后前置胎盘的发生率8倍于无瘢痕子宫
C.多次刮宫史
D.85%～90%为经产妇
E.受精卵滋养层发育与子宫内膜发育不同步
参考答案：A, C, D, E
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| Some people who find themselves unable to solve a problem react by just giving up.But it is not good to__1__from problems by giving up or by making__2__for failure.You may be sure that all young people go through the same__3__process that you are going through :__4__new situations,developing new skills,and testing their abilities. In many cases,we only "think" there is no__5__to a particular problem.But__6__we can overcome the problem and achieve the goal by making a direct attack. __7__,a boy wanted to be a debater.When he__8__for the debating team as a freshman,the coach thought he was _9__.He was shy；he had a high pitched (音调) voice；and his posture (仪态) was poor.By his junior year,he__10__the school debating team,and in his senior year he was__11__the team in his state.He achieved his goal because he had made a direct attack upon his problem. __12__attack is often the best way to meet problems,we have to be realistic in judging situations.__13__it is necessary to __14__either the tactics (策略) or the goal. A boy who wants to be a great football player may be too light and not quite __15__ for football.In this situation,becoming a great football player may be an __16__goal for him.__17__,he may become outstanding in tennis or golf,and__18__his desire to take part in sports. So,although direct attack is often the best way to __19__ problems,it is important to study the_20__and make a wise decision about what to do. | |||
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