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The United States has more tornadoes (龙卷风) than any other country in the world. In normal year there are 800 to 1, 000 tornadoes. Most happen in the middle part of the country. Tornadoes form when warm and cool air meet. In the Midwest, the warm air from the Gulf of Mexico often meets the cold air from Canada.

The usual tornado season is March through May. Tornadoes form most often in the afternoon and early evening. There is often no warning of tornado. People who live in the Midwest know the signs (征兆) of tornado activity. The sky becomes dark, often a greenish color. Dark clouds appear in the sky and there is often large hail (冰雹) . Suddenly, there is loud sound, like train or jet plane. Sometimes, two, three, five, ten or more tornadoes can form over a large area.

This type of tornado activity hit Oklahoma and Kansas in May 1999. The day was stormy, with heavy thunderstorms in the afternoon. As the storms continued, tornadoes began to form. Dozens of tornadoes hit towns and neighborhoods in Oklahoma then in Kansas. Some stayed on the ground for several hours, destroying everything they touched. The tornadoes killed 43 people and injured 600 others. They destroyed thousands of homes and businesses. In some areas, not one home stood. In other areas, the tornadoes destroyed every home on the left side of the street, but didn't touch any homes on the right side. The tornadoes lifted people and cars into the air and then threw them back down to earth. So it is important to know where to hide and how to protect yourself in the face of a tornado.

【小题1】What can we learn about tornadoes in America?
A.They may appear in groups.
B.They usually happen in the summer.
C.There are more tornadoes in the Eastern States.
D.There are more than 1, 000 tornadoes every year.
【小题2】The tornadoes that hit Oklahoma and Kansas in May 1999 __________ .
A.took place at the same timeB.were the biggest in history
C.came and went quicklyD.brought death and destruction
【小题3】What will the author most probably talk about next?
A.Tornado dangers and warning signs.B.How to stay safe during a tornado.
C.Different kinds of tornadoes.D.How a tornado forms.
19-20高一·全国·单元测试
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“Federal weather forecasters are predicting a‘near normal’number of storms this hurricane season, which runs from June 1 through November l. Between nine and 15 named storms are predicted to form in the Atlantic this year, ”said Neil Jacobs, administrator of the National Oceanic and Atmospheric Administration.

“Of those, between four and eight are predicted to become full-blown hurricanes, with winds capable of removing shingles(木瓦)and taking down power lines, ” Jacobs said Thursday at a news conference to announce the forecast. “And between two and four storms are expected to strengthen into so-called major hurricanes, with winds strong enough to break trees and tear off roofs.”

Gerry Bell, the lead hurricane forecaster at NOAA, said people shouldn't be fooled into satisfactions by the word “normal”.“Nine to fifteen named storms are a lot, ”he said. “Two to four major hurricanes are a lot. So the key message is:We're expecting a near-normal season, but you need to start getting prepared for the hurricane season now.”

This year's outlook is shaped by two competing meteorological (气象学的)phenomena. On one hand, the climate pattern known as El Nino (厄尔尼诺)is happening this year, which generally prevents hurricane activity in the Atlantic. At the same time, the water at the surface of the tropical Atlantic and the Caribbean is warmer than usual. That warm water acts like an engine for hurricanes, fueling their creation and making them bigger and wetter.

While ocean temperatures change under normal climate conditions, global warming is also causing ocean waters to get hotter. The overall global surface temperature has already risen more than 1 degree Fahrenheit compared with pre-industrial times. That suggests increasing hurricane risk, as big and wet storms become more likely.

【小题1】How many storms may take place at least this year?
A.4.B.9.C.15.D.24.
【小题2】What can be the effect of the full-blown hurricanes?
A.Blowing off shingles.B.Destroying houses.
C.Causing earthquakes.D.Taking down dams.
【小题3】What can we know from Gerry Bell's words?
A.People were often fooled by the NOAA.
B.There will be less major hurricanes this year.
C.There has been a near-normal hurricane season.
D.People should prepare for the coming hurricanes.
【小题4】What is the direct cause of hurricanes?
A.El Nino phenomenon.B.The increasing population.
C.Environmental pollution.D.Warmer water of the ocean.

Check out the facts about the tsunami (海啸)and learn some interesting information related to these great walls of water that can cause so much destruction. Find out what causes tsunamis and read about some recent examples of tsunamis that have occurred around the globe.

Tsunamis are huge waves of water that are usually caused by earthquakes or volcanic eruptions (喷发).As a tsunami approaches the shore, water may move back from the coast. If it is shallow enough, water may be pulled back hundreds of metres. If you are on the shore and observe this phenomenon, you'll know that a tsunami is on the way.

Regions in tsunami danger zones often have warning systems in place to give people as much time to evacuate (撤出)as possible. When tsunamis hit shallow water (often near the coast), they slow down but increase in height.

An earthquake in the Indian Ocean off Indonesia in December 2004 caused a tsunami that killed over 200,000 people in 14 countries. In March 2011, the Tohoku earthquake off the eastern coast of Japan caused a tsunami that was a major factor in the death of over 15,000 people. The tsunami waves created by the 2011 Tohoku earthquake reached heights of over 40 metres in northern Japan, destroying coastal towns and causing a number of nuclear accidents.

The Japanese word "tsunami'' literally means "harbour wave''. Tsunamis are sometimes referred to as tidal waves but this term has fallen out of favour because tsunamis are not related to tides.

【小题1】Which of the following shows a tsunami is around the corner?
A.An earthquake takes place.
B.The water near the shore is pulled back.
C.The water marches towards the coast.
D.The water near the shore is very shallow.
【小题2】What can we learn from the passage?
A.More people died in the 2004 Indian Ocean earthquake than in the 2011 Tohoku earthquake and tsunami.
B.The term ''tidal wave'' is used more often than ''tsunami''.
C.The word ''tsunami'' is from British English.
D.Some nuclear accidents happened after the 2004 Indian Ocean earthquake.
【小题3】The underlined parts "out of favour'' can be replaced by ''        ''.
A.uninterestingB.unsuitable
C.unforgettableD.unimaginable
【小题4】The passage is mainly developed by         .
A.stating some facts
B.making some comparisons
C.making some conclusions
D.providing some quotations

Looking to make the biggest impact during a crisis? This guide will help you get the necessary resources to the right people quickly and easily, as well as help you prepare for a potential emergency. 【小题1】.


Create a fundraiser.

Put simply, more people equals more money, and creating your own fundraiser is a great way to encourage people who want to help. If you’re dealing with a local natural disaster, start by raising money through your community 【小题2】, on the organization’s site or through an app; thus, you won’t have to deal with transferring donations through your personal account.


Collect supplies.

【小题3】. Start by checking an organization’s website; they often have lists of what is needed and where to send it. Or call community offices in the affected area to see what specific needs they have.


Donate your skills or time.

You can contact your local emergency services, to see if they are seeking a helping hand. If you don’t have a particular skill, offer your time to help with clean up afterward. However, always call or check online first. 【小题4】. In reality, you will be adding one more person to the already strained situation.

【小题5】.

One of the most helpful things you can do in a natural disaster is to prepare yourself ahead of time. Not only will these preventive measures protect you, but they will also limit damage in case disaster strikes. The first step is to find out which disasters are most likely to affect you. The second step is stocking up on essential emergency items.

A.Learn to cooperate with others
B.Prepare for a natural disaster in advance
C.Here is how to help those affected by natural disasters
D.Designate a charity to receive the funds so people can donate directly
E.If you’re trying to figure out how to help with natural disasters, you’re in the right place
F.It’s best to take a little extra time to figure out what is really in short of
G.Do not go as an individual volunteer to a disaster zone expecting to find ways to help

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