空气中含量最高的气体是 A.氮气 B.氧气 C.二氧化碳 D.水蒸气 发布时间:2017-06-09 05:54 │ 来源:www.tikuol.com 题型:选择题 问题: 空气中含量最高的气体是A.氮气B.氧气C.二氧化碳D.水蒸气
题型:选择题 The teacher couldn’t make himself ____ attention to because students were addicted to the short message.A.payB.to payC.paidD.to be paid 查看答案
题型:选择题 The modern Olympics started in _______ and now it is spreading the Olympic spirit all over the world. [ ]A. Paris B. New York C. Beijing D. Athens 查看答案