问题 阅读理解

阅读理解。

     I finished my last evening shift of the week and could hardly wait to get home. I took off my nursing

shoes, relaxed and then said goodnight to the rest of the girls and headed out of the door.

     It was so cold and I could see the ice crystals in the air. As I approached my car, I saw one of my

coworkers standing by the bus stop. I thought it would only take a couple of extra minutes to give her a

ride home, and besides, it was too cold to be standing outside on the coldest night in January.

     We chatted as I drove and before we knew it, we arrived at her house. As she headed up the steps

to her door she turned around. "Do you know how to get to your house from here?" "How hard can it

be? I'll just backtrack the way I came."

     I started driving. Nothing looked familiar, but at first that didn't bother me since I'd never been to this

neighborhood before. I kept driving, and soon I sensed that something was wrong. I recognized nothing,

not the neighborhoods, not even the street names. My husband would be worried about me. I looked

down at my watch. It was now 2:30. I'd left work at 11:30 pm.

     I stopped my car. I thought I'd better take stock of my situation. My gas gauge (汽油量表) was

slowly going down. In total defeat I put my head down on the steering wheel and asked for help. I lifted

my head. I saw a shadow down the road in front of me. It was a car. What was a car doing in the middle

of nowhere at 2:30 in the morning?

     Hesitantly, I got out of my car and knocked on the window of the other car. An elderly man slowly

rolled his window down.

      I said, "I'm lost and don't know how to get back into town."

     In silence, he started driving. I drove behind him.

     Finally I recognized a familiar street. As I turned to head home, I lost sight of my guiding angel. When

I pulled into my driveway the warning light for my gas tank turned on.

1. The first paragraph tells us that the writer _______.

A. lived near her workplace

B. used to go home by bus

C. worked in a woman's hospital

D. had been working at night for a week

2. Why did the writer stop her car?

A. To consider and judge the situation.

B. To check whether there was gas.

C. To prevent the car breaking down.

D. To turn to somebody for help.

3. How did the old man help the writer?

A. He told her the way to the town.

B. He led her by driving in front.

C. He called the police to help her.

D. He sent her to her home with his car.

4. When the writer got home, _______.

A. she thanked the old man very much

B. her husband was waiting for her anxiously

C. the oil in her car was just going to run out

D. she was totally frozen on the cold night

5. What might be the suitable title for the passage?

A. Keep up and you will succeed at last.

B. Meeting a friendly old man in trouble.

C. Giving a ride to my coworker at night.

D. Losing my way on a cold winter night.

答案

1-5: DABCD

实验题

(9分)南南同学跟妈妈学烧紫甘蓝(紫卷心菜),用油炒后加入食醋,发现紫色的叶片立即变红,激发了他的探究欲望。

[提出问题]紫甘蓝的汁液能作酸碱指示剂吗?

[进行实验]取紫甘蓝叶片少许在研钵中捣烂,用少量水浸泡,滤出蓝紫色的汁液。将汁液分别滴人下列液体中,观察其显示的颜色并记录。

液体名称白醋蒸馏水食盐溶液肥皂水纯碱溶液
紫甘蓝汁液显示的颜色红色蓝紫色蓝紫色蓝色绿色
[得出结论门紫甘蓝的汁液             (选填“能”或“不能”)作酸碱指示剂。

[质疑并求证]紫甘蓝的汁液在均为碱性的肥皂水和纯碱溶液中,为何显示不同颜色?

用pH试纸测得上述肥皂水和纯碱溶液的PH分别为9和u,则肥皂水的碱性比纯碱溶液的碱性(选填“强”或“弱”)            

查阅资料

pH7~910~1112~14
紫甘蓝汁液显示的颜色蓝色绿色黄色
 

[得出结论2]紫甘蓝的汁液在不同pH范围内显示的颜色不同,利用紫甘蓝的汁液还可以区分液体碱性的               

[拓展应用]柠檬酸是制汽水的原料之一,为探究其固体是否显酸性,南南同学联想到教材上二氧化碳相关实验的设计,准备了三朵用紫甘蓝的汁液染成蓝紫色的干燥小花。

取干燥的花①和喷上水的花②,分别放人盛满二氧化碳的两个集气瓶中,发现花①不变色,花②变成了          色。在干燥的花③上直接撤少量柠檬酸固体,花不变色,说明了             ;再向该花喷水,蓝紫色的花上出现了红色。

[反思]上述花的变色均与水有关,水的作用分别是:

花②中                                                 ;

花③中                                                 

名词解释