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题型:阅读选择 题类:模拟题 难易度:困难

四川省绵阳市安州区2018届九年级下学期英语二诊试卷

阅读理解

    Computers can injure you. Most other injuries happen suddenly. For example, if you fall off a bicycle and break your arm, it happens very quickly. But computer injuries happen slowly.

Your eyes

    Too much light can injure your eyes, so never sit too close to a computer screen. Your eyes should be at least 50 centimeters from the screen. Remember to look away from it sometimes. This gives your eyes a rest.

    When you use a computer, the window should be on your left or your right. If it is behind you, the light will reflect(反射) on the screen. If the windows is in front of you, the sun and the screen will both shine into your eyes.

Your hands and wrists(手腕)

    Hand and wrist injuries can happen because the hands and wrists are moved in the same way hundreds of times. If you use a keyboard for a long times, follow these three rules:  1) Rest your wrists on something.  2) Keep your elbows at the same height as the keyboard.  3) Stop sometimes and exercise your hands, wrists and fingers in a different way.

Your back

    Some people sit for many hours in front of a computer. If you sit in a wrong way, you can injure your back or your neck. So you should sit with your back straight. The top part of the screen should be in front of your eyes. Your forearms(前臂), wrists and hands should all be parallel to(与......平衡) the floor. If you are sitting for a long time, get up every 30 minutes and exercise your arms, legs and neck.

    Enjoy your computer, but use it safely.

(1)、The underlined word “injure” means “        .”
A、保护 B、影响 C、伤害 D、帮助
(2)、Your eyes should         .
A、be close to the screen B、be less than 50 centimeters from the screen C、face the window D、be more than 50 centimeters from the screen
(3)、To protect your hands and wrists you should         .
A、Keep your elbows above the height of the keyboard B、Keep your wrists hanging without touching anything C、Keep your elbows below the height of the keyboard D、Stop playing computer sometimes and exercise
(4)、Which of the following is true?
A、Sitting wrongly is only bad for your wrists and fingers. B、Your eyes should be at the same height as the top part of the screen. C、You should have a rest every two hours. D、You should sit in front of a screen and play computer for a long time.
(5)、Which is the best title of this passage?
A、How to Use a computer Safely. B、How to Play Computer Games. C、How to Protect Your Eyes. D、Computers Are very Harmful.
举一反三
    Many young people all over the world love to travel and see the world. Have you heard of backpackers? They are normally young people who travel cheaply with just one rucksack(背包) and comfortable walking boots. They buy local food in supermarkets to save money and at the same time become friends with local people.
    Some people prefer adventure tours. Brave people may try bungee jumping from the bridge overlooking the Victoria Falls in Africa with only a rope around their legs.Some enjoy the challenge of rock climbing in the Alps in Switzerland. Others may go snowboarding in the Rocky
Mountains in the USA.
    Have you ever heard of an ecotourism (生态旅游)? It rr;eans a holiday in which people come close to nature but are very careful not to damage the nature beauty or living things in the area. How can this be possible? Let's read an interview with people who enjoyed a swimming with dolphins tour.
    Interviewer what was the most exciting part ofyour holiday?
    Sharon from South Africa I felt excited when I heard the sound of wild dolphins approaching me in the water and then swimming directly under me. An image I will never forget.
    Xavier from Portugal There were two dolphins below us swimming downwards. One stopped and looked back at me as if to say 'What are those strange beings?" Fantastic!
    Interviewer Did you feel that your holiday helped local people and areas to keep their beautiful environment?
Jane from New Zealand The hotel and the whale and dolphin watching comparues employ(雇佣) local people. They used to hunt those whales and dolphins, but now they can eam money from tourism and don't have to kill them. Not many boats are allowed at the same time so these animals aren't bothered. The boat companies also work to educate the local schools about the importance of protecting these wonderful creatures.
    Helen from England I am glad they are not killing the whales and dolphins any more, but the cars and boats use fuel which could cause pollution and make the sea less clean.
    Well, what do you think? Thousands of people visit the Forbidden City or the Great Wall of China every year. Do you think that's a good thing, or do you feel that China's important historical sites can be damaged? Are there any ways of sharing your treasures  (珍宝)  but keeping them in good condition?

阅读理解

    The Smallest Life Around Us

    Tiny plants and animals live all around us.We cannot see them because they are so small,but they are everywhere. They live in the soil,in the air,and in rivers and oceans.They grow on mountains and in caves.Some live in the ice at the north and south poles; some live where it is very hot.They are found throughout cities and in the country. They grow on other plants and animals.Some are even living on you,on your skin,hair,and inside your body,in your mouth,nose,and all through your body.

    These tiny plants and animals are called microbes.The word microbe is made from two other words:micro,meaning small,and bios,meaning life.So,microbe means small life.

    Microbes have been on earth for a very long time.They may have been the first forms of life to be alive.Today there are more microbes in the world than all other living things.

    People did not know microbes had existed(存在) long.They were too small for them to see.But people did see many changes in their world﹣important changes.And they did not know what caused them.They saw food that they kept too long change color and begin to smell bad.They saw cuts and wounds grow red and painful and become worse. They saw old plants and leaves and trees crumble apart on the forest floor and disappear into the soil.Such changes were a natural part of the world,but people did not understand them.They did not know these changes were evidence(证据) of tiny plants and animals growing all around them.

阅读下列材料,从A、B、C、D四个选项中选出最佳答案。C
    Scientists in Britain and the United States have made a new kind of enzyme (酵素) that eats plastics (塑料). With its help, plastics can be turned into smaller parts and go away quickly. Scientists believe that, in the future, it could solve the problem of plastic pollution.
    The enzyme is able to break down PET, a form of plastic. PET was first made in the 1940s and is now widely used to make plastic bottles. It can remain in the environment for many years and pollute large areas of land and water. So it has always been a headache to deal with the waste from PET and other plastics.
    The researchers made the discovery (发现) while examining the structure of a natural enzyme in Japan. They found that the natural enzyme was helping to break down PET plastics. So, they decided to make small changes to the enzyme by adding some amino acids (氨基酸). It made the natural enzyme's plastic-eating abilities work faster and better.
    John McGeehan, one of the lead researchers, said, “We've made an improved enzyme. It's better than the natural one. And we are trying to make more improvements to it.” He went on, “The enzyme is not harmful to humans or animals, and it is friendly to the environment. So we are considering putting it into wider use.”
    The team is now trying to make the enzyme break down PET in large quantities (大量地). “We'll see that the plastic pollution may be stopped with this technology. However, there is still a long way to go,” John McGeehan added.
阅读理解

    Twinkle, Twinkle Little Star is a lovely song for children, but it has two misunderstandings (误解). First, stars aren't little. Some may be Earth-sized, but most are bigger than Jupiter, the largest planet in the solar system (太阳系). Second, they don't twinkle; they shine. And the brightness and color of the light from each star provide information about its temperature, size and even its age. viewing the stars from Earth is a bit like looking at them through a water filter (过滤器) because the air is thick compared to the emptiness of space. What is more, air is always moving, so starlight appears to be moving, too. The air also makes stars appear dimmer (暗淡的) than they would be if we could see them from space.

    If you stop and look at the sky carefully on a dark and moonless night, it's easy to find color differences among stars. The color of a star is a signal of its surface temperature. The hottest stars are blue, and the next hottest are white. Yellow stars like the sun are next, while red stars are the coolest of the visible (可见的) stars. Many red stars are so dim that people can't see them at all, and some stars hardly send out any light at all. One reason that stars different in brightness is that hotter stars produce more energy than cooler ones, but another important reason is that some are much bigger than others.

Some stars appear brighter to humans simply because they're closer. Astronomers rank (排列) the brightness of stars which are seen from Earth by giving them a name known as magnitude (光度) —the smaller the magnitude, the brighter the object. They have also designed a number that ranks stars according to how bright they are when compared to each other. With a magnitude of minus 26.7, the sun is the brightest object in the sky.

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