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Many people like the feeling of the gentle wind in spring. Many like to see the falling leaves dancing in the wind in autumn. But sometimes, when the wind becomes a storm, it can be very destructive(具有破坏性的).
A series of such storms struck the US last month and caused very serious damage and human pain.
Every year, major storms cause many problems around the world. There is nothing people can do to stop these powerful forces of nature. But new techniques are helping scientists to predict(预测) how, when, and where big storms will happen. The more exact scientists’ warnings are, the better people can prepare for the storms.
Predictions are improving. “We’re gotten better over the years, especially the last few years,” says Phil Klotzbach, a scientist at an American university. How is a storm formed? Even if scientists know where a storm will happen, winds can suddenly change, carrying the storm to a new direction. “For a hurricane to happen, conditions have to be just right, ” Klotzbach says.
First, the ocean water needs to be warm enough so that it evaporates and rises into the air. As it rises, the vapor(水蒸气)cools and turns back into liquid. This process gives off heat. This produces energy like an engine that causes winds to increase. It drives the formation(形成) of a hurricane.
If wind speeds reach 40 miles per hour, the system is called a “tropical storm”(热带风暴), and it gets a name. At 75 miles per hour, it becomes a hurricane.
Hurricanes that hit the US start when a thunderstorm forms off the coast of Africa. Storms also develop over tropical waters in other parts of the world.
On average, 60 or 70 storms form off Africa every year. About 10 of them get names. There are usually about six hurricanes. Two tend to be very big, with winds of 115 miles per hour or higher.
The hurricane season lasts from June to November. Ninety percent of all hurricanes hit in August, September, and October.
49. According to the passage, hurricanes usually ____.
A. form off the coast of Africa and America
B. travel at 40 miles per hour and get its name
C. cause sea winds to rise and blow over the sea
D. hit parts of the world in summer and autumn
50. The underlined word “evaporates” probably means “____”.
A. begins to move B. gets lost C. becomes hot D. changes into gas
51. Which of the following about the information of a hurricane is the correct order?
a. The ocean water evaporates and goes into the air.
b. Heat creates energy and causes winds to increase.
c. The vapor cools.
d. The ocean water is warm enough.
e. The vapor changes back into liquid.
f. This course gives out heat.
A.a, d, e, b, c, f B.a, b, c, f, d, e C.d, a, c, e, f, b D.d, a, b, c, e, f
52. According to the passage, the speed of the biggest two hurricanes reaches ____.
A.115 miles per hour B.110 miles per hour
C.75 miles per hour D.95 miles per hour
查看习题详情和答案>>It’s 2035. You have a job, a family and you’re about 40 years old. Welcome to your future life. Getting ready for work, you pause in front of the mirror, “Turn red,” you say. Your shirt changes from sky blue to deep red. Tiny preprogrammed electronic(智能电子元件) is rearranged in your shirt to change its color. Looking into the mirror, you find it hard to believe that you are 40. You look much younger. With amazing advances in medicine, people in your generation may live to be 150 years old. You’re not even middle-aged.
As you go into the kitchen and prepare to pour your breakfast cereal into a bowl, you hear: “To lose weight, you shouldn’t eat that,” from your shoes. They read the tiny electronic code(电 子源码)on the cereal box to find out the nutrition details. You decide to listen to your shoes. “Kitchen, what can I have for breakfast?” A list of possible food appears on the counter as kitchen checks its food supplies.
“Ready for your trip to space?” you ask your son and daughter. In 2005 only specially trained astronauts went into space—and very few of them. Today anyone can go to space for day trip or longer vacation. Your best friend even works in space. Handing your children three strawberries each, you add, “The doctor said you need these for space travel.” Thanks to medical advice, vaccination shots(防疫针) are a thing of the past. Ordinary foods contain specific vaccines. With the berries in their mouths, the kids head for the front door.
It’s time for you to go to work. Your car checks your fingerprints and unlocks the doors. “My office. Autopilot,” you command. Your car drives itself down the road and moves smoothly into traffic on the highway. You sit back and unroll your e-newspaper. The latest news downloads and fills the viewer. Looking through the pages, you watch the news as video films rather than read it.
What changes the color of your shirt?
A. The mirror. B. The shirt itself. C. The counter. D. The medicine.
How do the shoes know that you shouldn’t eat the breakfast cereal?
A. By pouring the breakfast into a bowl.
B. By listening to the doctor’s advice.
C. By testing the food supplies in the kitchen.
D. By checking the nutrition details of the food.
The strawberries the children eat serve as ______.
A. breakfast B. lunch C. vaccines D. nutrition
How is the text organized?
A. In order of time B. In order of frequency.
C. In order of preference(偏爱). D. In order of importance
查看习题详情和答案>>根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
The following is a father’s advice to his son\daughter, who has just graduated from high school:
First of all, congratulations on your graduation! Graduation from high school means that a new stage of life is ahead of you. 【小题1】
Clean your own room and do your own laundry. 【小题2】 Cleanliness is indeed close to godliness(神圣的).
Don’t mistake knowledge for wisdom. No matter how much information or knowledge you have accumulated(积累), you’ll never make sound judgments if you don’t have wisdom. 【小题3】
If you can imagine the possible future outcomes of your present decisions and actions, you can avoid mistakes. And if you can reflect(思考)on the mistakes you have made, you can avoid making the same mistakes again and again. Such is wisdom.
Don’t complain. When you take up a job, do your best to carry it out. 【小题4】
Finally, be an early bird. 【小题5】 And the sight of the rising sun will warm your heart and give you energy for the day ahead. Besides, being an early bird, you have plenty of time to take exercise or do a lot of work.
A.After you have messed up something, you should learn to clean it up yourself. |
B.If you get up earlier than the sun, you can watch it rise up slowly into the sky. |
C.Once you started a job, you should try your best to do it well. |
D.Don’t waste time complaining about it, no matter how difficult and boring it is. |
F.Get up early and go for some morning exercises to build up your body.
G.Wisdom comes from imagination and reflection 查看习题详情和答案>>
仔细阅读下列10个句子,根据所给的首字母和中文意思提示在答题卷的相应位置写出所需单词
【小题1】If you turn on the lights when there is full of gas in the room , the house may__________. (爆炸)
【小题2】The old man dressed in black is one of my __________ (亲戚), so I must go to say hello to him.
【小题3】Traffic is getting heavier and heavier, people should be encouraged to use public ____________. (运输)
【小题4】It is no pleasure __________ (定居) in a place where there are no neighbors around.
【小题5】When he entered the meeting room, nobody said hello to him. He felt _________. (忽视)
【小题6】Lucy goes to school by bike every day, she says that c__________ is a good form of exercise.
【小题7】She looked calm, but a_________ she was very nervous.
【小题8】It s__________ me a lot to see how my neighbor treated their children.
【小题9】As we all know, one li is e___________ to half a kilometer.
【小题10】When you have a high fever, you will probably s__________ from a headache.