题型：任务型阅读 题类：常考题 难易度：普通
湖南省长沙铁路第一中学2019届高三上学期英语第三次阶段性测试试卷
Radar is an electronic device that detects planes, ships, coastlines, landmarks, and even storm clouds. The name radar comes from the first letters of the words radio direction and ranging. As the human eye uses light waves to see, radar "sees" with radio waves. Without radar, planes could not land safely in bad weather and ships could not move safely in thick fog.
In the 1800s it was discovered that radio waves could be reflected from objects. But scientists did not make great advances in radar research until the 1930s, when the world was threatened by war. It has been used widely in almost every conflict since then.
Echoes make it possible for radar to work. When a beam of radio waves is sent out, it strikes on an object and returns an echo. This echo is picked up by radar and recorded on a screen similar to television screen. On the screen an observer sees a flash, or a blip, that shows the direction and distance of the object.
Airport control towers use radar to guide planes in for safe landings. Almost all large ships depend on radar to prevent collisions with icebergs or other ships. Weather forecasters "see" the size, direction, and speed of storms on radar screens. Astronomers can even use radar to measure accurately the distance to the moon. Thus, the device has generated major advancements.
Huge radar antennas have been installed all over the United States. They guard us against possible enemy attacks. We have ballistic—missiles (战略导弹)warning systems that can alert us to attacks when missiles are more than 1,000 miles away. Other radar systems warn us against enemy aircraft and even spying space satellites.
A. Police track speeders in radar-equipped cars.
B. These measurements are now highly accurate.
C. The device can be used in a wide range of fields.
D. It is therefore especially valuable to shippers and travelers.
E. During World War II many countries used radar effectively.
F. Today radar is used by commercial airliners and weather forecasters.
G. Strengthening national defense is one of radar's most important functions.
You walk into the classroom, look at that white piece of paper in front of you and are told you've got an hour and a half to do it. That can make anyone nervous, but here is the guide to stay calm.
Get a good night's sleep the night before the test, and eat a healthy breakfast next day. {#blank#}1{#/blank#} If you're too tired, you won't remember what you learnt the night before.
Get to class a little earlier. If you get there early, you'll make sure to get your favorite seat. {#blank#}2{#/blank#}
Breathe. Before the test, breathe in through your nose deeply and slowly. {#blank#}3{#/blank#} Repeat this several times. If you experience a sudden panic during the test, perform the exercise again.
Skip questions if necessary. {#blank#}4{#/blank#} If you come across a difficult question, skip the question and move on. You can come back to it at the end of the test if you have time, and later questions may help you get the answer(s) to the one(s) you skipped.
{#blank#}5{#/blank#} Don't panic if you notice other students writing very quickly or handing in their tests early. Tell yourself it's just a test. Really, it is. No matter what happens, everything will be OK.
A. Avoid staying up the night before the exam. B. Act like you are the only person in the room. C. Don't spend too much time on any one question. D. If you believe you can do it, you will find you can! E. A little exercise will help you remain calm during any stressful situation. F. Then, hold your breath for 3-4 seconds and blow out slowly through your mouth. G. You'll not also feel more relaxed if you don't get there in time or worse yet, late. |
The book ABigFatCrisis: TheHiddenForcesBehindObesityEpidemic— andHowWeCanEndIt by Deborah Cohen, a senior natural scientist, is very popular now. {#blank#}1{#/blank#} But according to this book, the following are some misunderstandings of obesity or being overweight.
1)．If you're obese, blame your genes.
{#blank#}2{#/blank#} Yet, between 1980 and 2000, the number of Americans who are obese has doubled—too quickly for genetic factors to be responsible. At restaurants, a dollar puts more calories on our plates than ever before, because restaurant meals usually have more calories than what we prepare at home, so people who eat out more frequently have higher rates of obesity than those who eat out less.
2)．If you're obese, you lack selfcontrol.
Research shows that if we are faced with too much information, we have a tendency to make poor choices on diet. {#blank#}3{#/blank#} Even, the most vigilant(警觉的)people may not be good controllers of themselves.
3)．{#blank#}4{#/blank#}
Although the US Department of Agriculture estimates that fewer than 5 per cent of Americans live in the “food deserts”， about 65 per cent of the nation's population is obese. For most of us, obesity is not related to access to more fresh fruits and vegetables, but to the choices we make in supermarkets.
4)．The problem is not that we eat too much, but that we don't exercise.
Michelle Obama's “Let's Move” campaign is based on the idea that if kids exercise more, childhood obesity rates will decrease. {#blank#}5{#/blank#} In fact, although a drop in workrelated physical activity may explain up to 100 fewer calories burned, leisure physical activity appears to have increased.
A．Lack of access to fresh fruits and vegetables is a cause of obesity. B．Obesity rates have increased. C．Fresh fruits and vegetables we choose in a supermarket are related to obesity. D．But there was no obvious decrease in physical activity levels as obesity rates climbed in the 1980s and 1990s. E．People hold different views on obesity. F．People benefit a lot from physical activities. G．Our world has become so rich in food that we can be led to consume too much in ways we can't understand. |
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