关于扩散运动和布朗运动，下列说法中正确的是（ ）
A．扩散运动和布朗运动是由外部原因引起的液体分子的运动
B．扩散运动和布朗运动虽然不是分子的运动，但它能反映出分子的运动规律
C．布朗运动的剧烈程度与悬浮颗粒的大小有关，这说明分子的运动与悬浮颗粒的大小有关
D．扩散运动和布朗运动的剧烈程度都与温度有关，所以扩散运动和布朗运动也叫做热运动
A、扩散现象指不同的物质相互接触时，彼此进入对方的现象；布朗运动是悬浮微粒的无规则运动，不是分子的无规则运动，故A错误；
B、扩散运动和布朗运动虽然不是分子的运动，但它能反映出分子的运动规律，故B正确；
C、颗粒越小布朗运动越明显，温度越高，分子热运动越剧烈，分子的运动与悬浮颗粒的大小无关，故C错误；
D、分子永不停息的无规则运动叫做热运动，而非固体微粒，故D错误；
故选B．
| 阅读理解。 | ||||||||||||||||||||||||
| While it is expected that students come to university with the ability to take a good set of notes, this is not always the case (情形). High school may not have asked for it, so good listening and note-taking skills may need to be developed. | ||||||||||||||||||||||||
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| 1. During a listening lesson, _____. | ||||||||||||||||||||||||
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| A. students prefer to talk to each other B. most students might be absent-minded C. the students might lose interest after 20 minutes D. students don't have to pay attention to the last part of the lesson | ||||||||||||||||||||||||
| 2. Which of the following is NOT true according to the passage? | ||||||||||||||||||||||||
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| A. You should learn to go over your lessons often. B. Taking notes in class can help you master the main idea better. C. Pre-reading what you read might help you understand the material better. D. The writer is not quite satisfied with high school education. | ||||||||||||||||||||||||
| 3. The article is probably written for _____. | ||||||||||||||||||||||||
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| A. high school students B. English teachers C. university students D. grown-ups | ||||||||||||||||||||||||
| 4. The best topic of the passage should be _____. | ||||||||||||||||||||||||
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| A How to Learn English Well B. How to Be a Confident Learner C. Being an Active Listener D. Listening and Note-Taking |