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What can lift roofs off buildings and sweep houses into the air? Tornadoes can. Tornadoes come in many sizes. Some tornadoes are only a few feet across. Others are more than a mile wide. Some tornadoes touch down for a short time. Others travel for hundreds of miles.
Why do tornadoes happen? Scientists are not sure. Tornadoes form from giant thunderstorms called supercells. A supercell happens when warm, moist (潮湿的) air rises to mix with cold, dry air. The mixing of cold and warm air causes the air to spin (快速旋转). The spinning wind turns into a cloud in a funnel shape. As the cloud turns, the wind becomes stronger. When the funnel cloud touches the ground, it is a tornado.
The National Weather Service (NWS) tries to help people stay safe during tornadoes. If they put out a tornado watch, a tornado might strike. If they put out a tornado warning, a tornado has been spotted (发现).
If there is a tornado warning, it’s important to get to a safe place. Go indoors. The safest place is a basement. If you can’t get to a basement, go into a bathroom. Stay away from windows. The spinning air in a tornado makes things fly around. This can be dangerous. It’s always important to protect your head. You should get close to the ground. Go under a desk or table. You can even lie down in a bathtub (浴缸). If you are in a tall building, go to the stairs. If you are in a car, find lower ground and lie down. Otherwise, wear your seat belt and lean forward. If you are outside, lie down on the ground. It isn’t safe to stay inside a mobile home in a tornado. It is better to go into a car.
Tornadoes are symbols of the power of nature. People still have many questions about tornadoes. What is it really like inside a tornado? Can we predict its routes? Maybe we will find out one day.
() 25. Which picture best shows the “funnel shape” in Paragraph 2?
A.
() 26. How does the writer develop Paragraph 4?
A. By giving numbers. B. By giving examples.
C. By drawing pictures. D. By answering questions.
( ) 27. The following sentence can best fit at the beginning of ______ .
There is no way to be sure that a tornado will strike.
A. Paragraph 2 B. Paragraph 3 C. Paragraph 4 D. Paragraph 5
() 28. What is the writer’s attitude towards tornadoes?
A. Afraid. B. Angry. C. Curious. D. Positive.
What can lift roofs off buildings and sweep houses into the air? Tornadoes can. Tornadoes come in many sizes. Some tornadoes are only a few feet across. Others are more than a mile wide. Some tornadoes touch down for a short time. Others travel for hundreds of miles.
Why do tornadoes happen? Scientists are not sure. Tornadoes form from giant thunderstorms called supercells. A supercell happens when warm, moist (潮湿的) air rises to mix with cold, dry air. The mixing of cold and warm air causes the air to spin (快速旋转). The spinning wind turns into a cloud in a funnel shape. As the cloud turns, the wind becomes stronger. When the funnel cloud touches the ground, it is a tornado.
The National Weather Service (NWS) tries to help people stay safe during tornadoes. If they put out a tornado watch, a tornado might strike. If they put out a tornado warning, a tornado has been spotted (发现).
If there is a tornado warning, it’s important to get to a safe place. Go indoors. The safest place is a basement. If you can’t get to a basement, go into a bathroom. Stay away from windows. The spinning air in a tornado makes things fly around. This can be dangerous. It’s always important to protect your head. You should get close to the ground. Go under a desk or table. You can even lie down in a bathtub (浴缸). If you are in a tall building, go to the stairs. If you are in a car, find lower ground and lie down. Otherwise, wear your seat belt and lean forward. If you are outside, lie down on the ground. It isn’t safe to stay inside a mobile home in a tornado. It is better to go into a car.
Tornadoes are symbols of the power of nature. People still have many questions about tornadoes. What is it really like inside a tornado? Can we predict its routes? Maybe we will find out one day.
() 25. Which picture best shows the “funnel shape” in Paragraph 2?
A.
() 26. How does the writer develop Paragraph 4?
A. By giving numbers. B. By giving examples.
C. By drawing pictures. D. By answering questions.
( ) 27. The following sentence can best fit at the beginning of ______ .
There is no way to be sure that a tornado will strike.
A. Paragraph 2 B. Paragraph 3 C. Paragraph 4 D. Paragraph 5
() 28. What is the writer’s attitude towards tornadoes?
A. Afraid. B. Angry. C. Curious. D. Positive.
答案
25. D 26. B 27. B 28. C
