在教学方法设计中，人文学科多采用（）。
A、实验室实验
B、实际作业
C、讲授法
D、案例教学
参考答案：C
Jack _________ Alice for at least 20 years.
A．has married
B．has married with
C．has been married with
D．has been married to
在异位妊娠中超声显示宫内假性胎囊占()
A．60%
B．50%
C．40%
D．20%
E．10%
