问题 选择题

生活中的下列做法不符合科学道理的是(  )

A.蚊虫叮咬皮肤时分泌蚁酸引起皮肤肿痛,在叮咬处涂抹肥皂水以减轻痛痒

B.用燃烧的方法区别毛料衣物和合成纤维衣料

C.用汽油擦衣服上的油污

D.用食盐水清除水垢

答案

A、蚁酸呈酸性,肥皂水呈碱性,通过酸碱中和能降低酸性引起的不适,做法正确,不合题意;

B、毛料衣物属于蛋白质,燃烧时有烧焦羽毛味,可以用来与纤维衣物的区分,此项不合题意;

C、油污能溶于有机溶剂,此项不合题意;

D、食盐水和水垢中的碳酸钙、氢氧化镁不能发生反应,故不能清除水垢,此项符合题意.

故选D

阅读理解

阅读理解。

     I love it at night. It's peaceful. And when it cools down I sometimes do some ironing. I don't really care

for it. I work full-time and I am too busy for most housework. I remember the old woman who taught me

to iron. I was about 15 and I had to get a job taking care of a woman to make a living. She had been an

able-bodied, healthy woman until the accident that caused her to be paralyzed.

     The woman sat in an electric wheelchair all day. She could only move her head and arms. She would tell

me how to do things. She would teach me in great detail on the correct ways to do things. Her home was

perfect and beautiful. She would follow me around in her electric wheelchair to make sure I did everything

exactly right. I'm sure she had been a perfect homemaker. She would have me fold (折叠) everything,

including socks. I would complain silently and wish terrible things on her. She taught me the right way to

make the bed. I know sometimes she'd get frustrated (沮丧) and impatient with me. I knew she wanted to

do it herself. But she never shouted or scolded. She only insisted I do it right. I didn't like it much, but I did

it.

     Today I can iron pretty well. I know where to start on a shirt and the right way to do the trousers. Now

when I think about it, I don't think she is an old lady. I think she might have been about my age now. Anyway,

when I iron, I think of her and silently thank her for all the things I learned.

1. The writer used to take care of the lady because ________.

A. she wanted to learn to do housework

B. she was a friend of the lady's

C. she had to earn some money

D. she couldn't find a room to live in

2. The underlined word 'paralyzed' in the first paragraph may mean '________ '.

A. destroyed

B. deaf

C. seriously ill

D. unable to walk

3. The little girl was ________  when the lady taught her how to do housework.

A. encouraged to learn

B. unwilling to learn

C. delighted to learn

D. recommended to learn

4. Now the writer ________.

A. is still afraid of the lady

B. hates the strict lady

C. admires the disabled lady

D. is very grateful to the lady

单项选择题 案例分析题