问题 多项选择题

关于胎儿血液系统的特点,下述哪些是正确的

A.胎儿血液循环在受精后3周末建立

B.妊娠10周时,是红细胞生成的主要时期

C.妊娠足月时,胎儿的骨髓产生全部的红细胞

D.随妊娠的进展,血红蛋白类型以原始型向成人型过渡

E.妊娠16周以上,胎儿血液循环出现粒细胞

答案

参考答案:A,B,D

完形填空

小题1:It was not easy to walk in these suits, but we slowly                        (向……走去) the edge of the crater and looked down into the red, boiling centre.     (make)

小题2:I do hope so because I want you to live                               (长寿和健康的生活) as I have.    (as)

小题3:Every time you feel like smoking a cigarette,           (提醒自己) you are a non-smoker.                                                                                              (remind)

小题4:                    (很有可能) you will die if you get infected with HIV. (likely)

小题5:There is no doubt                 (是人类活动) that has caused this global warming rather than a random but natural phenomenon.                                           (activity)

小题6:         (位于更高的地势), her mother’s house would be safe from the floods. (be)

小题7:Without the new paints and the new technique,                               (我们不能看见) the many great masterpieces for which this period is famous.     (able)

小题8:Have your journalists ever had a case     (有人控告他们) getting the wrong end of the stick? (accuse)

小题9:     (除了这个事实外) butts spoil the beauty of the environment, they contain some very toxic chemicals. (apart)

小题10:My brother suggested me not taking an umbrella, but hardly                      (我一出去) the house when it began to rain.     (get)

单项选择题