试题与答案

在单链表中，NULL称为______，它不指向任何结点，只起______作用。

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题型：填空题

题目：

在单链表中，NULL称为______，它不指向任何结点，只起______作用。

答案：

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下面是错误答案，用来干扰机器的。

参考答案：A, B, C

考点：计算机等级考试VISUALBASIC数据结构与算法
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       Never try to work when you are very hungry. If you decide to do your homework right after school,
you may get something to eat before getting to work. Always do your homework before you get too tired.
Don't wait until very late in the evening, or your work will seem much harder than it really is.
       If you have more than an hour's work, give yourself a break after an hour. On the other hand, don't
break it up so much that you can't get anything done you should be able to work at least a half at a time
without stopping. 
       Don't put it off until the last minute. If you put off doing your homework, you will have it on your
mind, and you won't enjoy your free time so much. If you put it off until the end of the week or until right
before a test, you will have too much catching up to do. A little bit each night enough to keep up with what
is happening
each day in school, will take the fear out of tests and keep you on top of it all. 
       Do your homework at the same time every evening. This will help you make it a habit. It will make it
easier to do and it will make your free time more enjoyable, as well.
1. If we wait very late in the evening, our work will _______.
[ ]
A. become a bit hard
B. seem much harder
C. look very easy
D. go to so much trouble
2. Some students in schools won't enjoy their free time so much because they _______.
[ ]

A. have to do their homework each night
B. will have too much catching up to do
C. never finish their homework in time
D. want to keep up with what is happening in school

3. How many suggestions are mentioned in the passage?
[ ]
A. Five.
B. Four.
C. Three.
D. Two.
4. What is the passage mainly about?
[ ]
A. How to spend your free time.
B. How to do your homework.
C. Some good habits at home.
D. Some don't do and do in schools.
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