题干

通过对宇宙和微观世界的学习,你认为下列认识中正确的是(  )

A:蓝墨水滴在水中会慢慢散开,说明分子间有斥力

B:用鼻子嗅气味能辨别出醋和酱油,表明分子在运动

C:固体之所以比液体更难压缩,是因为固体分子比液体分子大

D:宇宙是一个有层次的天体结构系统,恒星是其中绝对不动的天体

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答案(点此获取答案解析)

B

同类题4

第一节  语篇翻译阅读下面的短文,将划线部分译成英文或中文。

    What are magic words? Words like 'thank you', 'please' and 'sorry' can work wonders in our daily life. These polite expressions are used every day in American – among strangers, between friends or with family. 1. People with good manners always communicate with others well by using these magic words.

    What should you do when you receive a gift for your birthday? 2. 你最好坐下来写一封感谢信。3. The words 'thank you' are very important and used very often. We say them when someone hands us a letter, passes us a book, offers us a drink, or lends us an umbrella.

    'Please' is another important word, but many people forget to use it. It is not polite to ask someone for help without saying 'please'. 4. We are supposed to use it when we ask for something, too. It may be a book, a pen, or more milk. It may be in the classroom, at home, or at the bus stop. We can use 'please' to make a request(请求)pleasant.

    5. 我们也应该学会说对不起If we have hurt someone's feeling, we will have to say 'sorry'. When we have told a lie and regret it, the same word should be used. Sometimes we have forgotten something or broken a promise, so we need to explain with the word as a beginning. 'sorry' is such a word that can make people forget wrongs.

    'Thank you! Please! Sorry!’ – these words are simple but useful. Man said them long ago. We use them now. So will our kids.