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A microscope is a useful instrument for observing small objects. By producing a bigger image, the microscope reveals details that are undetectable to the naked eye(裸眼).
Before using the microscope, please read the instructions below.
CAUTION: Microscopes are both delicate and expensive and must be handled with care.
1. Always carry the microscope with two hands — one supporting the base and the other on the arm.
2. Avoid stretching the wire of the lamp across a walkway.
3. Keep the stage clean and always use a glass slide for specimens(样本).
4. To avoid crushing the glass slide when focusing, begin with the lens close to the specimen and gradually back off to focus.
5. Keep the microscope covered to prevent the dust while it is being stored.
HOW TO USE THE MICROSCOPE:
1. Plug(接通电源) in the lamp.
2. Place a sample of what you wish to observe on a slide.
3. Adjust the mirror so it reflects light from the room up into the objective lens. When the mirror is correctly adjusted, a complete circle of light iwll appear when you look through the eyepiece.
4. Place your slide with the specimen directly over the center of the glass circle on teh stage. If it is a wet slide, be sure the bottom of the slide is dry.
5. With the LOW POWER objective leans placed over the slide, use the coarse focus knob to lower the lens to the lowest point.
6. Look through the eyepiece with one eye while closing the other eye. Slowly raise the lens until teh focus is relatively clear.
7. Use the fine focus knob to fine -tune(微调)the focus.
8. Without changing the focus knobs, switch to the HIGH POWER objective lens. Once you have switched to HIGH POWER, use only the fine focus knob to make the image sharper.
1.Which of the following is the correct way to use a microscope according to the text?
A．Use one hand to carry the microscope
B．Place a sample directly on the clean stage
C．When stored, the microscope should be adjusted.
D．Look through the eyepiece with one eye.
2.If you want to observe a thin piece of hair, which of the following should you do first.?
A．Switch to objective lens. B．Adjust the mirror.
C．Look through the eyepiece. D．Place the hair on a glass slide.
3.According to the text, you could see a complete circle of light _____.
A．after correctly adjusting the mirror
B．while looking at the specimen on a glass slide
C．after slowly raising the objective lens
D．before positioning the mirror correctly
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—Is that the small town you often talked about?
—Right, just the one____ you know I used to work for years.
A. that B. which C. where D. what
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— Is that the small town you often refer to?
— Right, just the one ______ you know I used to work for years.
A. that B. which C. where D. what
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—Is that the small town you often refer to?
—Right, just the one________you know I used to work for years.
A．that B．which C．where D．what
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Every living cell contains genes. They are too small to be seen in a microscope, but they are very important. Each set of genes in the body contains all the instructions needed to make a human being. Some genes determine hair color. Some determine the shape of a nose. Some genes help determine your height and even your weight.
Genes are made of a chemical called DNA-the letters stand for deoxyribonucleic acid(脱氧核糖核酸). In the early 1950's, two scientists, Francis Crick and James Watson, figured out how the parts of DNA fit together. Once scientists understood this structure, it became possible to take pieces of DNA apart and put them together in new ways. New kinds of genes could be made in this manner.
Scientists have studied the genes of many plants and animals. They have worked out which genes affect the color of a tomato and the thickness of its skin. Working out which genes determine which features is called genetic mapping, scientists have begun the Human Genome Project, an ambitious effort to map all the genes in the human body.
Some genes may be defective(有缺陷的). For example, something might be wrong with the gene that makes blood clot(凝聚). A baby born with this defective gene could suffer serious hemorrhages(出血) or even bleed to death because his or her blood fails to clot. If scientists ever learn how to map all the genes in our bodies, they can determine whether or not an unborn child has any defective genes. They might even discover how to treat these genes before the child is born.
1.What was the achievement of Francis Crick and James Watson?
A. They discovered why people have different hair colors.
B. They learned that some people bleed for long periods of time.
C. They looked at human cells under the microscope.
D. They worked out the structure of DNA.
2.What is the main idea of this passage?
A. Defective genes can never be repaired.
B. Genes are too small to be seen through a microscope.
C. Genes help scientists understand how living things develop their characteristics.
D. The Human Genome Project may explain the role of every gene in the body.
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阅读下面短文，根据其内容写一篇60词左右的概要。
Is a knife useful instrument or a dangerous weapon? It depends on how it is used. It’s the same with technology and one of those greatest inventions is cell phones. They have revolutionized the human existence. This is possible only because they are getting cheaper and cheaper. The technology has made it even easier to give them a longer life.
Undoubtedly, if cell phones are in right hands, no matter how far we are setting we can talk anytime anywhere! We can watch favourite TV shows, listen to favourite songs,etc, as cell phones are equipped with all high-tech features. In fact, it’s good to parents as well as children. Parents can monitor their children and children are also safe. If anyone is an any ind of danger, ahe or he can call for help immediately.
There are always two sides of a coin. The technology has caused a danger that we keep ignoring. The cell phones have progressed rapidly and at the same time they provide us with more tasks than what we would attempt. When a person is multitasking rather than complete a single task, this causes burden and results in stress. Also cell phones have made terrorist attacks in the world very easy. Besides, children spend much of their time in playing games instead of going out and playing, which is very harmful to them.
We should always remember that there lives a wise man between the valley of two mountains. Are cell phones a useful instrument or a dangerous weapon? The answer lies in our hands.
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Strange Baby-Naming Laws
Germany Parents are banned by law from using last names and the names of objects and products as first names. A child’s first name must clearly indicate his or her sex, and all names must be approved by the office of vital statistics in the area in which the child was born.
Iceland The country’s naming committee consults the National Register of Persons to determine if a name is acceptable. If parents want to go off-list, they must apply for approval and pay a fee, and the name must contain only letters in the Icelandic alphabet.
New Zealand The country’s Births, Deaths, and Marriages Registration Act of 1995 prohibits parents from choosing a name that “ might cause offense to a reasonable person; is unreasonably long; or is, includes, or resembles an official title or rank,” including, apparently, Adolf Hitler and Yeah Detroit—both names recently rejected.
Denmark If Danish parents prefer a moniker not on the list of 7,000 preapproved baby names, they must get permission from local church and government officials. Fifteen to 20 percent of the 1,100 reviewed names—including creative spellings of common names, last names as first names, and unusual names—are rejected each year.
1.You can tell whether a baby is a girl or a boy according to the first name in _____.
A. Germany B. New Zealand
C. Iceland D. Denmark
2.In Iceland, the names should _____.
A. be approved by the office of vital statistics.
B. be accepted by the National Register of Persons.
C. contain only letters in the Roman alphabet.
D. be paid for some money.
3.Which name is accepted in New Zealand?
A. Bin Laden B. Talula Does The Hula
C. John Smith D. Keenan Got Lucky
4.According to the passage, which of the following is true?
A. Parents should pay a fee for babies’ names if the names are rejected.
B. Each year about 150-200 reviewed names are rejected in Denmark.
C. Adolf Hitler is banned in Iceland.
D. Danish babies’ names should be on the list if parents can’t get the permission.
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Valentine’s Day, a day traditionally reserved for expressing romantic love, is observed practically all around the world. However, not many people are familiar with Sweetest Day. Actually it is a holiday, especially designed to express love and care for those who were routinely neglected（忽视）by society.
Sweetest Day was the idea of Herbert Birch Kingston, who worked for a company in Cleveland, Ohio. He felt that there were plenty of children, especially orphans and poor kids, who didn’t necessarily get the attention they deserved. Thus in 1922, he launched the first Sweetest Day to give out boxes of candy to mainly poor children.
Since the day picked was the third Saturday in October, this became the traditional time to celebrate Sweetest Day. The tradition was so enjoyed that people often looked beyond kindness to treating their own friends or family to treats on Sweetest Day.
In the US, Sweetest Day is celebrated primarily in the Northeastern region of the US, still on the third Saturday of October. Yet news of the tradition, which began nearly 100 years ago, has spread to other parts of the country, especially as people who lived in those areas moved elsewhere. People may distribute candy or small gifts to those in patient homes, hospitals, foster homes, or mental institutions, and they may also treat friends and family to little gifts from the heart.
In keeping with the original tradition, celebrating Sweetest Day should really be most focused on people who ordinarily don’t have the good fortune of attention from friends or family, either due to difficult family circumstances or to poverty. This can be a great tradition to start if your community doesn’t routinely celebrate the day, and there are many candy manufacturers that are willing to help donate or reduce costs on gifts intended for people in unfortunate circumstances.
1.The original purpose of Sweetest Day is to ________.
A. provide an occasion to know orphans
B. make those poor children happy
C. make your friends and family happy
D. distribute candy to those lovely children
2.What do people barely do on Sweetest Day?
A. Buy flowers for your sweetheart.
B. Visit patients who have to be in hospital.
C. Give friends gifts to make them happy.
D. Care for children who lost their parents.
3.We can learn from the passage that ________.
A. it is vital to contact the candy manufacturers
B. it is necessary to call on friends or families
C. it is important to help those in need
D. it is common to serve your community
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The Japanese have a genius for dreaming up small, useful and fun machines. You must have used or at least heard of Sony’s walkman, Nintendo or Sega’s video games, and Bandai’s Tamagotchi. And how about karaoke, invented by Daisuke Inoue?
Daisuke, who? Not many people have heard of him, and he never made much money from his invention. But anyone who has ever experienced the thrill of singing karaoke in front of a crowd has Mr.Inoue to thank…
Daisuke Inoue is an easygoing man with a quick smile. He was born in the suburbs of Osaka in 1940. At Osaka Technical High School he took up the drums, because he says, “All you have to do is hit them.” Before long he was making money as a drummer in a Hawaiian band that played in the old dance-halls left behind by American soldiers.
By 1970, he and six partners were playing in the clubs of nearby Kobe, accompanying middle-aged businessmen who wanted to sing traditional Japanese country and even army songs. His friends, Inous says, could all read music and so they could pick up the latest tunes (曲调). He, on the other hand, had to rely on memory and play by following the lips of the singer as they moved. “Out of 108 club musicians in Kobe,” he says. “I was the worst! And the clients (顾客) in my club were the worst singers!”
One client, president of a small steel company, was especially fond of Inoue’s slow, follow-along style. It made the president’s bad, out-of–time singing sound much better. One evening he wanted Inoue to play for him on a trip to a hot spring resort (胜地). The boss wanted to sing Frank Nagai’s Leaving Haneda Airport on a 7:50 Flight for his friends. But Inoue was unable to leave his job.
To help out his most loyal client, he decided to provide him with a tape. Inoue wouldn’t be there, but the singer would still have his accompaniment. Karaoke was born.
1. Daisuke Inoue took up the drums at high school because _______.
A. they were his favorite musical instruments
B. he knew they would help him make money
C. he thought they were easy to learn
D. it was easy for a drummer to find a job
2. What does the underlined word “they” stand for?
A. His partner B. His friends C. The latest tunes D. The singer’s lips
3. From this passage we know Daisuke Inoue was ______.
A. an outstanding musician B. not quite good at music
C. a good singer and dancer D. good at inventing things
4. Why did the president like Inoue’s playing so much?
A. Because Inoue followed his singing.
B. Because Inoue played very well.
C. Because he had got used to Inoue’s fast, exciting style.
D. Because Inoue was an easy-going man with a quick smile.
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In the past, a needle like a small sword could be used for letting liquid out of body parts which had______.
A.swollen up B.linked up C.dropped out D.worn out