下列不属于现代信息技术应用实例的是()。
A.远程教育
B.联网售票
C.可视通话
D.烽火告急
参考答案:D
Environment-friendly Olympics requires Beijing to improve its environment, turning it into an ecology-friendly city.
A.eventually
B.specially
C.absolutely
D.traditionally
下列各组物质中,化学键的类型相同的是
A.CaCl2和Na2S
B.Na2O和Na2O2
C.N2和Ne
D.HCl和NaOH