某年某地年龄在20～40岁的人口数是（） A.频数 B.频率 C.构成比 D.相对比 发布时间：2017-05-06 18:22 │ 来源：www.tikuol.com 题型：单项选择题 B型题 问题： 某年某地年龄在20～40岁的人口数是（）A.频数B.频率C.构成比D.相对比E.以上都不是
题型：单项选择题 B型题 We don't allow ____ here, but you ____ in the smoking room.A. to smoke; allow to smoke B. smoking; allow smoking C. to smoke; are allowed smoking D. smoking; are allowed to smoke 查看答案
题型：单项选择题 B型题 ．— Could you please tell me ______? — It’s next to the post office.A．where is the supermarket B．where the supermarket isC．where was the supermarket D．where the supermarket was 查看答案