用户对给水系统的要求主要包括水量、水质和（）等三个方面。
A、水价
B、水压
C、水源
D、水损
参考答案：B
Though in his seventies,the old man is still as ________ as a young man and hates sitting around doing
nothing all day.[ ]
A. enthusiastic
B. energetic
C. talkative
D. sensitive
世界最长的跨海大桥是我国的（）跨海大桥。
A.温州湾
B.胶州湾
C.杭州湾
D.莱州湾
