商品流通企业管理信息系统是由若干个独立单元组成的，这些独立单元称为子系统，各子系统又可以再被划分为若干个下属子系统，如此不断地由上至下逐层分解系统，使每个子系统的分目标服从于系统整体目标。这种特点体现的是系统的()。
A.功能性
B.层次性
C.整体性
D.稳定性
参考答案：B
解析：本题考查系统的层次性。系统的特点：功能性、整体性、层次性、相对稳定性。
任务型阅读，每空一词 There are different outdoor activities for different seasons. In spring we can fly kites .In summer, we can go swimming or sailing. In autumn, It is a good idea to camp or hike. In winter, we can go to ski or skate they bring us a lot of fun .they make us strong and fit, too. So it is important for people of all ages to take part in some outdoor activities at the right time. There are many group activities ,like football and basketball .The members work together for the same goal（目标）. So group activities need team spirit(团队精神). It is very useful for a person to have team spirit. It is good for us in life and work. Old people like walking and jogging .These outdoor activities don’t need much strength（气力）. Young people like exciting activities ,like diving（潜水）, skiing and horse riding. Children like fun activities like flying kites . Some outdoor activities are dangerous, like climbing rocks. So we must be careful when we take part in them .
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