下列物质中属于纯净物的是 [ ] A．新鲜的空气 B．澄清的_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列物质中属于纯净物的是 [ ]

A．新鲜的空气

B．澄清的石灰水

C．纯净的矿泉水

D．液态氧

答案

答案：D

选择题

—Excuse me, look at the sign over there, please. Could you stop smoking?
—Sorry, I ____ that.

A. didn't see
B. don't see
C. won't see
D. can't see

判断题

大型岛群大多分布于大陆的东岸。