"生命质量"这一术语最早出现的领域是（）
A.医学
B.社会学
C.心理学
D.生命科学
E.自然科学
参考答案：B
.He went there on foot and got very tired, but he _____ by bus. The fare was rather cheap.
A．could have gone
B．must have gone
C．ought have gone
D．will have gone
智能化系统集成应( )。
A．统一规划，统一实施B．统一规划，分期实施C．分期规划，分期实施D．分期规划，统一实施
