五、阅读理解。
A tornado(龙卷风) is a kind of strong storm with air which moves in a circle quickly. They can move over 200 miles per hour and cause a lot of damage. As they move across the land, they can easily pick up cars, trucks, and even houses, and then throw them very far. It is important to find a safe place if a tornado gets close.
A safe place could be a basement(地下室) or the lowest floor. If you are in a home without a basement, try to find a first-floor bathroom or a small room without windows in the middle of your house. You should curl up(蜷缩) into a ball and cover your head and neck with your hands.
But there are some people who actually want to get close to tornadoes. They are scientists who want to learn more about tornadoes. One of the best ways to do this is to get as close as possible to the tornado. They use special tools to measure(测量) what is happening in and around a tornado.
One special tool is called a tornado probe(探测仪). Inside the tornado probe, there are sensors(传感器) to measure wind speed, temperature, pressure and direction. Some probes even have cameras, so the scientists can see and understand what it’s like to be in a tornado.
To be able to get these measurements, the scientists have to get a tornado probe near or into a tornado. Scientists will try to guess where a tornado will go next. Then they drive to that location and put down the probe. If they do not guess correctly, they pick up their probe and try another place. If they are right, the tornado will go near or even right
over the probe. Then they take all of the measurements from the probe and use them to predict where future tornadoes may form and travel. And they can give people some warning to keep away from a dangerous tornado.
()1. If a tornado gets close, what should people do to keep safe?
A. Curl the legs up.
B. Find a big room.
C. Go to a basement.
D. Stay in a bathroom.
()2. What can the sensor in a probe measure?
①pressure ②direction ③temperature ④wind power
A. ①②③
B. ②③④
C. ①②④
D. ②③④
()3. What can we learn about the scientists from the last paragraph?
A. They risk their lives studying tornadoes.
B. They get close to a tornado to admire it.
C. They can easily put the probe in the right place.
D. They prevent the tornado from forming by measurements.
()4. What does the passage mainly tell us?
A. What a tornado is.
B. How dangerous a tornado is.
C. Where a tornado may form and travel.
D. How scientists do research work on tornadoes.
()5. Where may you find this passage?
A. In a novel.
B. In a science magazine.
C. In a storybook.
D. In a guidebook.

1.C 2.A 3.A 4.D 5.B

1. 根据原文第二段“A safe place could be a basement(地下室) or the lowest floor.”可知，龙卷风靠近时，安全的场所是地下室，对应选项C。2. 由原文第四段“Inside the tornado probe, there are sensors(传感器) to measure wind speed, temperature, pressure and direction.”可知，传感器测量的是压力、方向、温度，对应①②③，故选A。3. 从最后一段可知，科学家需靠近龙卷风放置探测仪，过程存在风险，体现他们冒着生命危险研究龙卷风；B选项“欣赏”错误，是研究而非欣赏；C选项“容易放对”与原文“猜错就换位置”不符；D选项“阻止龙卷风形成”错误，是预测而非阻止，故选A。4. 文章前两段介绍龙卷风的危险与安全措施，核心内容是科学家如何用探测仪研究龙卷风，主旨为科学家对龙卷风的研究工作，故选D。5. 文章涉及龙卷风的科学知识与科研内容，最可能出自科学杂志，故选B。