作业衡量可以通过速度、一致性、灵活性和（）等方面来具体说明所期望的完成周期。
A.故障与恢复
B.故障
C.恢复
D.可达性
参考答案：A
Peter has been busy these days and seldom ________ to come over to have a chat with me.
[ ]
A. doesn't he have time
B. does he have time
C. he has time
D. he hasn't time
《素问·刺法论》说：“正气存内，邪不可于”，其含义是( )
A．邪气是发病的重要条件
B．邪气伤人，正气必然受损
C．正气充足，与邪气相争
D．正气旺盛，邪气难以入侵
E．正气不足，邪气伤人
