肠病性肢端皮炎患者腹泻的发生率为（）
A.50%
B.60%
C.80%
D.90%
参考答案：D
The population of China is much ______ than that of ________ country in Africa.
A．more; any
B．bigger; any other
C．more; any other
D．bigger; any
输卵管妊娠破裂患者就诊的最主要症状是（）
A.停经史
B.早孕反应
C. * * 流血
D.下腹部剧痛
E.肛门坠胀
