急迫性尿失禁常见于
A．前列腺增生患者B．老年经产妇女C．尿路感染患者D．老年痴呆患者E．肾结石患者
参考答案：C
Tom has been absent for two days．Do you know what _________ to him?
A．has happened
B．would happen
C．was happened
D．had happened
排球半蹲准备姿势，身体重心的着力点（）
A.前脚掌拇指根部
B.全脚掌上
C.脚后跟上
