描述"x是小于100的非负整数"的Visual Basic表达式是【 】。
参考答案：x％>=0 and X％<100
解析：可以用类型声明符声明变量类型,下面是常用类型及其类型说明符： 整型％ 长整型& 单精度浮点数! 双精度浮点数# 货币型@ 字符串型$ 本题要在这个表达式中体现出3个重点,第1点是小于100,可写成"<100"；第2点是非负,可用">=0来表示"；最后1点要体现出X是整数,所以可在变量X后面加一个百分号"％"。
阅读下面的短文，然后从A-F选项中，为每一小段选择合适的标题, 并把答案写在答案卷上。
Listening is not as easy as someone thought. Even good listeners may recall only fifty percent of what they hear. Retention, the ability to remember and recall information, decreases about twenty to twenty-five percent after a few days. So no matter how well you listen in class, you’re always going to have to refresh your memory before a test! Unfortunately, many people have poor listening habits, and little listening training. To improve your listening skills, it’s important to understand what causes poor listening. 小题2:___________ If you find it difficult to concentrate solely on what a speaker is saying, there’s a good reason. The mind processes information much faster than a speaker can speak. The brain can process over 500 words per minute, while the average speaker talks at a rate of 124 to 250 words per minute. That means the mind can hear what’s being said and can think about something else at the same time. 小题3:____________  If you have a negative idea about the speaker or the topic, you’ll find it difficult to listen attentively. Hostile or captive audiences often have more difficultly listening than do favorable or voluntary ones.小题4:____________If a speaker speaks “above the heads” of an audience, people find it difficult to concentrate. Speakers who use unfamiliar words or who use incomplete explanations make it more difficult to listen. Speakers who “speak down” to audiences, failing to acknowledge what the audience already knows, also create mental blocks. 小题5:___________ When people listen selectively, they simply block out what they don’t want to hear. For instance, many people have habits that are dangerous to their health, like smoking. However, they often choose to block out what a speaker says about health risks. They may listen to a speech and think that the speaker’s message applies to other people, not them. In other words, they hear what they want to hear and ignore what they don’t want to hear. |