Three kids have been learning chemistry for only a few months. But they have already begun to challenge (挑战) a world famous scientist!
Li Weichi, Huang Runling, and Xiao Yan are from Zhongshan Huaqiao Middle School in Guangdong. They have just found a red cabbage that could be a new kind of acid-base indicator (酸碱指示剂). They want it to take the place of litmus (石蕊) paper.
"We've learnt to think of and ask questions about life by ourselves," said Li, "We work well with each other."
British scientist Robert Boyle discovered the use of litmus paper over 300 years ago. Now it is used widely in experiments all over the world.
But when the kids did some experiments in class last winter, they saw that the litmus paper didn’t turn very blue with base matter. It's hard to get a clear result.
Will there be a better indicator than litmus paper? The three kids decided to try and find out!
How? They went to collect over 40 plants in parks, gardens and markets. Then they ground (研磨) leaves, flowers and stems (茎) to get the pigments (色素) from them.
The kids mixed pigments with acid and base. They spent months watching carefully to see which paper showed the best color change. They decided it was the litmus paper!
"It's our first scientific journey, Huang said, "But it makes me want to try harder."

  1. 1.

    Whom did the three kids want to challenge?

    1. A.
      Their chemistry teacher.
    2. B.
      Their headmaster.
    3. C.
      Robert Boyle
    4. D.
      Thomas Edison
  2. 2.

    From the text, a red cabbage is a kind of ____.

    1. A.
      plant
    2. B.
      animal
    3. C.
      paper
    4. D.
      liquid
  3. 3.

    What is widely used as the acid-base indicator now?

    1. A.
      red cabbage
    2. B.
      litmus paper
    3. C.
      any plant
    4. D.
      any flower
  4. 4.

    The story mainly tells us ____.

    1. A.
      how to make litmus paper
    2. B.
      about the three kids' spirit
    3. C.
      scientists were wrong
    4. D.
      the kids are heroes

Zhang Li lies in bed sadly. The 24-year-old young man lost his right leg because of a blood disease. The doctor said that his 10 years of smoking had caused the disease. “I began to smoke when I was in Junior 3. It made me feel like a man and I thought it looked cool. Now I know I was really wrong.” said Zhang.
It is a mistake many teenagers make. It is said that about 40 million of the country’s young people between 13 and 18 have tried smoking. Nearly 68 percent of teenager smokers smoked their first one before the age of 13. Those who live in big cities started even earlier. Many teenagers see people smoking in the movies. But in real life, stars like Jackie Chan think smoking is a bad thing. In fact, smoking is one of the top killers in China. Each year one million people die from smoking-related(与吸烟有关的)diseases. Smoking causes illnesses like lung cancer and heart disease.
Doctors say that the younger a person starts smoking, the worse it will be. If a person starts smoking as a teenager, he or she may live twenty-two years less than non-smokers.

  1. 1.

    What kind of disease did smoking cause for Zhang Li?

    1. A.
      Lung cancer.         
    2. B.
      Blood disease.          
    3. C.
      Heart disease.
  2. 2.

    From the passage, we know Zhang Li started to smoke when he was      years old.

    1. A.
      13                   
    2. B.
      14                      
    3. C.
      18
  3. 3.

    The city’s young people         .

    1. A.
      knew that smoking was a bad thing
    2. B.
      tried smoking when they were in Junior 3
    3. C.
      started smoking earlier than those in the country
  4. 4.

    Which of the following is NOT TRUE according to the passage?

    1. A.
      Zhang Li had a disease and lost his left leg.
    2. B.
      Smoking may cause many kinds of diseases.
    3. C.
      Smoking may make you have a shorter life.
  5. 5.

    What does the underlined word “non-smokers ” mean in English?

    1. A.
      People who like smoking.
    2. B.
      People who smoke.
    3. C.
      People who don’t smoke.

Jack is an able(能干的)worker.He can do all the work in the factory and often helps his boss(老板),Mr. King.So his boss likes him and he gets much money.But he likes drinking and spends most money on drinks.When he drinks much,he can’t control(控制)himself.His wife(妻子)tells him to stop drinking,but he doesn’t listen to her.She has to leave him.Now he lives in a poor and old house alone(独自).
One Saturday evening,Jack feels very cold in his house.He can’t stay there and goes into a bar(酒吧).He drinks a lot,but he doesn’t have enough money with him.
Of course,he can’t pay for the drinks.The boss of the bar doesn’t let him out,so he begins to break the glasses and tables.A girl calls the police station and soon some policemen get there.They have to take Jack to the station.
“What do you bring me here for?”he shouts.
“We bring you here for drinking.”answers a policeman.
“That’s great!”Jack says happily.“Then when shall we start?”

  1. 1.

    Jack can get much money because _______.

    1. A.
      he is the boss
    2. B.
      he works in the factory for a long time
    3. C.
      the boss likes him
    4. D.
      he is able enough to help the boss
  2. 2.

    Jack’s wife leaves him because _______.

    1. A.
      he doesn't like her
    2. B.
      he gets no money in the factory
    3. C.
      he doesn’t stop drinking
    4. D.
      he doesn’t do housework at home
  3. 3.

    Jack is happy because he thinks_______.

    1. A.
      the policeman will drink with him
    2. B.
      the policeman pay for his drink
    3. C.
      the policeman will make friends with him
    4. D.
      the policeman wi1l give him some money

Some people like to get up early, but some do not. In fact, it is really good for us to get up early every day. Maybe those who don't like getting up early will not believe this, but it is true. Scientists made a survey in about one thousand people, and then they found that early rising(早起) people had less disease(疾病) than late rising people, and early rising people also look healthier than late rising people, and so on.
So we may know early rising is helpful in more than one way. First, it helps to keep us healthy. We all need fresh(新鲜的) air. But air is never so fresh as early in the morning. Besides, it is useful to do morning exercises.
Secondly, early rising helps us in our studies. In the morning we learn more quickly and find it easier to understand what we learn.
Thirdly, early rising can give us a plan of our work for the day. We cannot work well without a good plan.
Fourthly; early rising gives us enough time to get ready for our work, such as to wash our hands and faces and eat our breakfast.
Late risers may find it difficult to form the habit(养成习惯) of early rising. They have to make an effort(努力) to do so. As the English proverb says, "Early to bed and early to rise makes a man healthy, wealthy(富裕的) and wise. "

  1. 1.

    Early rising people are          than late rising people.

    1. A.
      fatter
    2. B.
      thinner
    3. C.
      healthier
    4. D.
      Cleverer
  2. 2.

    Air is the freshest         according to the passage.

    1. A.
      in the morning
    2. B.
      in the afternoon
    3. C.
      in the evening
    4. D.
      all the day
  3. 3.

    Which of the following is the result of early rising?

    1. A.
      People can get ready for their work.
    2. B.
      People can get fresh air.
    3. C.
      People can learn things more quickly and better.
    4. D.
      All of the above.
  4. 4.

    If a man always likes to get up late, it's          for him to form the habit of getting up early.

    1. A.
      easy
    2. B.
      difficult
    3. C.
      happy
    4. D.
      sad
  5. 5.

    As the English proverb says,            can make us healthy, wealthy and wise.

    1. A.
      getting up early
    2. B.
      going to bed early
    3. C.
      getting up late
    4. D.
      both A and B
 0  2572  2580  2586  2590  2596  2598  2602  2608  2610  2616  2622  2626  2628  2632  2638  2640  2646  2650  2652  2656  2658  2662  2664  2666  2667  2668  2670  2671  2672  2674  2676  2680  2682  2686  2688  2692  2698  2700  2706  2710  2712  2716  2722  2728  2730  2736  2740  2742  2748  2752  2758  2766  159627 

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网