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 meters above sea level, Salt water is already entering the country’s drinking water supply, as well as damaging plants that produce fruit and vegetable.__51___
___52___. 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 20-50cm by 2050. A century ago, St. Mark’s Square, the lowest point in the city, floodedd 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 degrees over the past century; scientists expect it to rise by extra 1-3 degrees over the next 100 years.
Warmer weather makes glaciersmelt, 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.
___53___. 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.___54____.____55____, the sea will swallow up millions of homes and the world will be flooded with “climate refugees” looking for somewhere to live.

TUVALU, a tiny country in the Pacific Ocean, has asked for help as 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 meters 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 24cm over the past 100 years. Experts say that it will have sunk another 20-50cm by 2050. A century ago, St. Mark’s Square, the lowest point 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, global warming causes Tuvalu’s rising sea level.
The average global temperature has increased by almost 0.5 centigrade degrees over the past century; scientists expect it rise by extra 1-3 degrees over the next 100 years.
Warmer weather makes glaciers (冰川) melt, and adds 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, the sea will swallow up millions of homes and the world will be flooded with “climate refugees” looking for somewhere to live.
68. We can infer from the second paragraph that         .
A. Tuvalu is in danger of being swallowed up by the sea
B. all Tuvalu’s islands are about five meters above the sea level
C. drinking water in Tuvalu has been destroyed
D. Tuvalu is often flooded by storms and waves
69. Put the following events in the right order.
a. Glaciers began to melt.                b. People burn coal ,oil and gas.   
c. The greenhouse effect is growing.       d. The earth is getting warmer and warmer       
e. The sea level is rising.                 f. More CO2 is produced.      
g. Many places are sinking into the sea.
A. d,f,b,c,a,e,g       B. b,f,c,d,e,a,g       C. f,c,b,d,a,e,g       D. b,f,c,d,a,e,g
70. What does “climate refugees” mean?
A. Climate changes.       B. Climate effect.     
C. People forced away from their homeland by climate.   
D. Rare animals moving from place to place for climate changes.
71 Which of the following is False according to the passage?
A. The sea level has risen about 10-25 cm in the last 100 years for warmer       temperatures.
B. The average global temperature has risen by 1-3 centigrade degrees over the past 100 years.
C. The warmer temperature causes the sea level to rise.
D. There will be huge climate changes unless the warming is stopped

TUVALU, a tiny country in the Pacific Ocean, has asked for help as 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 meters 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 24cm over the past 100 years. Experts say that it will have sunk another 20-50cm by 2050. A century ago, St. Mark’s Square, the lowest point 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, global warming causes Tuvalu’s rising sea level.

The average global temperature has increased by almost 0.5 centigrade degrees over the past century; scientists expect it rise by extra 1-3 degrees over the next 100 years.

Warmer weather makes glaciers (冰川) melt, and adds 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, the sea will swallow up millions of homes and the world will be flooded with “climate refugees” looking for somewhere to live.

68. We can infer from the second paragraph that         .

A. Tuvalu is in danger of being swallowed up by the sea

B. all Tuvalu’s islands are about five meters above the sea level

C. drinking water in Tuvalu has been destroyed

D. Tuvalu is often flooded by storms and waves

69. Put the following events in the right order.

a. Glaciers began to melt.                b. People burn coal ,oil and gas.   

c. The greenhouse effect is growing.       d. The earth is getting warmer and warmer       

e. The sea level is rising.                 f. More CO2 is produced.      

g. Many places are sinking into the sea.

A. d,f,b,c,a,e,g       B. b,f,c,d,e,a,g       C. f,c,b,d,a,e,g       D. b,f,c,d,a,e,g

70. What does “climate refugees” mean?

A. Climate changes.       B. Climate effect.     

C. People forced away from their homeland by climate.   

D. Rare animals moving from place to place for climate changes.

71 Which of the following is False according to the passage?

A. The sea level has risen about 10-25 cm in the last 100 years for warmer       temperatures.

B. The average global temperature has risen by 1-3 centigrade degrees over the past 100 years.

C. The warmer temperature causes the sea level to rise.

D. There will be huge climate changes unless the warming is stopped

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 meters above sea level, Salt water is already entering the country’s drinking water supply, as well as damaging plants that produce fruit and vegetable.__51___

___52___. 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 20-50cm by 2050. A century ago, St. Mark’s Square, the lowest point in the city, floodedd 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 degrees over the past century; scientists expect it to rise by extra 1-3 degrees over the next 100 years.

Warmer weather makes glaciersmelt, 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.

___53___. 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.___54____.____55____, the sea will swallow up millions of homes and the world will be flooded with “climate refugees” looking for somewhere to live.

E. The sea level could rise by one meter this century.

F. people face a lot of pollution.

G. much has been done about our planet .

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。
There's an old saying, “You can put more salt in the soup，but once it's in there，you can't get it out.”__1__ And your child can help！Here's an exciting experiment for your child to try：
Start by helping your child to mix salt into the water in the mixing bowl and stirring until it is fully dissolved溶解）．
___2__ Make sure that you don't let any of the salty water into it.
___3__ Then take a small rock，and place it right on top of the center of the plastic wrap，so that all of the plastic leans slightly toward the middle of the bowl where the cup is.
Put the whole setup in full，hot sun，and wait. Within an hour, you should see water droplets begin to form on the underside of the plastic. __4___
Wait, and then take the plastic off. A good amount of water should be in the small cup.
__5__ Guess what? No salt！The water vaporized蒸发）in the heat of the sun，and then returned to its liquid state. Salt doesn't do that一it stayed behind. You really can take the salt out of salt water！
As it happens，this is an excellent lesson in the way matter can change states.