购物、选举、高考、就业、结婚、旅游、促销等各种社会经济行为和活动属于（）。
A、状态与事实
B、状态与意见
C、行为与活动
D、理论与实践
参考答案：C
男性，60岁，突然头痛，眩晕，呕吐，行走不稳2小时，查体一侧肢体共济失调，眼球震颤。
以下最可能的诊断是（）
A.脑梗塞
B.壳核出血
C.尾状核头出血
D.小脑出血
E.SAH
He ＿＿articles for our wall-newspaper these three years, and he ＿＿about forty articles.
A．has been writing； has written
B．has been writing； wrote
C．is writing； has been writing
D．has written； has written
