口腔预防教研室集体备课时,李老师提到口腔预防医学开始发展的时间是 ()
A.18世纪末
B.20世纪中期
C.19世纪初
D.19世纪末
E.20世纪初
参考答案:B
—I’ll come to attend your speech at 9:00 tomorrow morning.
—I’m sorry. By then my speech _________ and I __________ TV at home.
A.will end; will watch
B.is to end; will watch
C.will be ended; am going to watch
D.will have ended; will be watching
在劳动力市场动态均衡的三种模型中,劳动力供给弹性小于劳动力需求弹性的情况称为()
A.发散型蛛网
B.封闭型蛛网
C.收敛型蛛网
D.开放型蛛网