严重先天性心脏病孕妇伴有发绀，对胎儿的影响为（）。
A.流产
B.早产
C.死胎
D.胎儿宫内窘迫
E.胎儿畸形
参考答案：A, B, C, D, E
Our hands are very important and we can do many things them. [ ]
A. as
B. through
C. by
D. with
能引起志贺样腹泻（粘液脓血便）的大肠埃希菌是（）
A.产肠毒素型大肠埃希菌（ETEC.
B.肠致病性大肠埃希菌（EPEC.
C.肠侵袭型大肠埃希菌（EIEC.
D.肠出血型大肠埃希菌（EHEC.
E.肠凝聚型大肠埃希菌（EaggEC.
