常见的咨询单位违约行为主要包括______。
A．履行不能 B．履行迟延 C．拒绝履行 D．履行不当E．赔偿损失
参考答案：A,B,C,D
While travelling, I had to Charge up my digital camera every day as the battery _______quickly. [ ]
A. shut up
B. ran out
C. ended up
D. turned out
______是对一类相似对象的属性和行为特性的抽象描述。
