心脏病患者在产后多长时间内极易发生心力衰竭（）
A.产后24小时内
B.产后2小时内
C.产后5天内
D.产后7天内
E.产后10天内
参考答案：E
组织中人的行为动力主要有哪几种类型（）
A.物质动力
B.精神动力
C.竞争动力
D.信息动力
E.管理动力
Amy _____ the school library. She _____ books three times a week.[ ]
A. has gone to; has used to borrow
B. has been to; used to borrow
C. has gone to; has been used to borrowing
D. has been to; is used to borrowing
