问题
单项选择题
在较高的抽象层次上，传统的程序流程图与UML 中活动图最根本的区别在于 （9） 。
A．程序流程图明确地指定了每个活动的先后顺序，而活动图仅描述了活动和必要的工作顺序
B．活动图不提供循环控制结构，而程序流程图提供
C．活动图不能表示并发活动，而程序流程图可以表示并发活动
D．两者采用不同的图形符号系统
答案
参考答案：A
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在较高的抽象层次上，传统的程序流程图与UML 中活动图最根本的区别在于 （9） 。
A．程序流程图明确地指定了每个活动的先后顺序，而活动图仅描述了活动和必要的工作顺序
B．活动图不提供循环控制结构，而程序流程图提供
C．活动图不能表示并发活动，而程序流程图可以表示并发活动
D．两者采用不同的图形符号系统
参考答案：A
Are you ____ about how to study and make your study more effective(有效率的)? We all know that some students usually study very hard for a long ___. This is very good, but it doesn’t ___a lot, for an effective student must have enough sleep, enough food and enough rest and exercise. Every day you need to go out for a walk or visit some friends or some nice places. It’s ____ for your study. When you return ____ your studies, your mind will be refreshed and you’ll learn more ____ study better. Psychologists(心理学家)__ __ that learning takes place this way. Here take English learning as an example. First you make a lot of progress and you will feel happy. Then your language seems to stay the same. So you will think you are learning ____ and you may give up. This can last for days or even weeks , yet you can’t give up. Later your language study will again take another big ____. You will see that you really have been learning all along. If you get enough sleep, food, rest and exercise, studying English can be very effective and ____. Don’t give up along the way. Learn slowly and you’re sure to get a good result.
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