实践没有止境,创新也没有止境。我们要突破前人,后人也必然会突破我们。这是社会前进的必然规律。这说明人类的实践活动具有 A.历史性 B.社会性 C.物质性 D.能动性 答案:AEverybody showed great respect to the old doctor, who devoted everything he had to _____ the poor conditions of the local hospital. A. improving B. improve C. to improve D. being improved