脊髓灰质炎疫苗加强
A．出生至2个月B．出生2个月以上C．出生3个月以上D．2岁E．4岁
参考答案：E
33．_________ in some rural schools that the teacher is even unable to walk through the rows of desks．
A．The classroom is as crowded
B．So crowded is the classroom
C．As crowded the classroom is
D．The classroom is such crowded
腹膜刺激征可见于
A．绞窄性肠梗阻
B．急性出血坏死性胰腺炎
C．消化道穿孔
D．急性胰腺炎
E．急性单纯性阑尾炎
