问题 问答题

科学家长期研究证实,构成物质的微粒有______、______和______.如汞是由______构成的,水是由______构成的,氯化钠是由______构成的.

答案

构成物质的粒子有分子、原子和离子;汞属于金属,是由汞原子直接构成的;水是由水分子构成的;氯化钠是由钠离子和氯离子构成的.

故答案为:分子;原子;离子;汞原子;水分子;钠离子和氯离子.

多项选择题 案例分析题
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Dear Carol,

I wear braces (牙箍) and I know I look just terrible in them. Is there anything I can do to improve my appearance until they come off?

Connie N.

Philadelphia, PA

Dear Connie,

Start by thinking about how good you are going to look when your braces come off. If you are negative about your appearance, people will pick that up right away about you. In the meantime there are several things that you can do to lift your spirits:

Change your hairstyle. Be sure to get a good cut so that the shape of your hair will be flattering to your face and also good for your type of hair (fine, thick, straight, curly, etc.) Choose a hairstyle that draws attention away from your face. Hair pulled back into a pony-tail or into a ball on top or slightly off-center can be attractive and practical for this purpose.

Keep skin clean. If you choose to wear makeup(化妆品), it should look natural. Blusher(腮红) and lip gloss(润唇膏) in light tones of peach or pink are best.

Be well-groomed(打扮). Neatness really counts. People see a total look about you before they ever become aware of your braces. And first impressions are lasting ones!

68. Why did Connie write to Carol?

A. Because she really cared about her clothes.

B. Because she cared much about her appearance.

C. Because her teeth were not good.

D. Because she didn’t know how to make up.

69. Carol’s idea about one’s appearance is that ___________.

A. change your hairstyle and you will look beautiful

B. wear your make-up and you will look good

C. neatness is not important

D. if you yourself don’t think you look smart, neither will people

70. Carol tries to let Connie know that ___________.

A. the deepest impressions one leaves on others is the first ones

B. spirits are important when we talk about one’s appearance

C. there are some practical ways to draw people’s attention away from where you don’t feel good 

D. all of the above

71. The underlined word “count” means “___________” in the last paragraph.

A. say numbers in order        B. be of importance           C. not include        D. be accepted