按网络所覆盖的地域范围可把计算机网络分为广域网、城域网和局域网。校园网一般属于（）网。
参考答案：局域
It is exactly ______he often fails in the exam ______ makes his parents worried about him.
A．what; that
B．that; which
C．that; that
D．what; what
有两瓶从外观无法区别的“水”，其中一瓶是硬水，一瓶是软水，区别它们的最简便方法是加入肥皂水、振荡，有较多泡沫的是________水。
