统一资源定位器URL的格式是()。
A.协议://IP地址或域名/路径/文件名
B.协议://路径/文件名
C.TCP/IP协议
D.http协议
参考答案:A
----Jack, is maths difficult to learn in High school?
----Sure. No subject can be learned well __________hard work.
A.without
B.through
C.by
D.with