TUVALU,a tiny country in the Pacific Ocean,has asked for help as it fears it will be swallowed up by the sea.
Storms and huge waves are a constant threat and none of Tuvalu's nine little islands is more than five metres above sea level.Salt water is already entering the country's drinking water supply,as well as damaging plants that produce fruit and vegetable. Without urgent help,the country's days are numbered.
But Tuvalu is not the first place to face sinking into the sea.Venice,a historic city in Italy best known for its canals,has sunk about 24 cm over the past 100 years.Experts say that it will have sunk another 20&50 cm by 2050.A century ago,St.Mark's Square,the lowest point in the city,flooded about nine times a year.Nowadays,it happens more than 100 times.
While Venice is slowly sinking into the mud on which it stands,Tuvalu's rising sea level is caused by global warming.
The average global temperature has increased by almost 0.5 centigrade degree over the past century; scientists expect it to rise by an extra 1&3 degrees over the next 100 years.
Warmer weather makes glaciers （冰川） melt,adding more water to the ocean.The warmer temperatures also make water expand,so it takes up more space,causing the sea level to rise.The sea level has risen about 10&25 cm in the last 100 years.
The main cause of global warming is human pollution.Through burning coal,oil and gas,people have been increasing the greenhouse gases in the atmosphere,such as CO2.This adds to the power of the greenhouse effect,making the planet even warmer.
Many scientists believe that,if the warming is not stopped,there will be huge climate changes.The sea level could rise by one meter this century.
Should this come true,millions of homes will be swallowed up by the sea and the world will be flooded with “climate refugees” looking for somewhere to live.
1.The people of Tuvalu are afraid that _________.
A.they will be in great hunger
B.salt water will cover the little country
C.without help,the country will be flooded by rain water
D.the mud under Tuvalu is going to sink 2.5 cm every year
2.What is the result as the climate goes on?
A.Venice will sink 24 cm in the following 100 years.
B.Only the glaciers can be melted.
C.It makes the seawater reduced.
D.The sea level will be raised.
3.Why is the globe becoming warmer and warmer?
A.Because that the seawater is being polluted.
B.Because a lot of terrible fires have broken out in the cities.
C.Because,with the development of industry and the living level rising,more and more coal,oil and gas are being burnt.
D.Because the greenhouse is bigger and bigger.
4.What does the underlined word“refugees”mean?
A.changes
B.sea waves
C.animals
D.people who lost their homes
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1. B 读完第1和 2段，可知Tuvalu是太平洋上的一个小国，因面临被海水淹没的危险，正在寻求援助。只要你站在图瓦卢人的角度上，很容易看出，提供物资援助是不能帮助Tuvalu摆脱困境的，排除A项。从it will be swallowed up by the sea入手很容易地选出B项，salt water即sea water。 提示： 
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