护理理论、护理实践的核心和基础是（）
A.人
B.健康
C.环境
D.护理
E.心理
参考答案：A
—How long ______ here?
—Only ten minutes. Tim ______ here with me. [ ]
A. are you; has walked
B. are you; walked
C. have you been; walked
D. have you been; has walked
