21. She had trouble_(find)his lost car.
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（ )9. 一His brother is used to telling lies. He is a_boy.
—It will bring much trouble to him if he always does so.
A. kind B. honest C. terribly D. dishonest
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3. Is there anything v_to get from this article to work out(解答）this problem?
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10. Now Sam is in an important p _ in his company, so he works harder than
before.
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Our factories and homes burn coal and oil. Every year, we have forest fires somewhere. Many scientists believe that the climate is changing.
The earth will perhaps be warmer by about 7 degrees centigrade at the South Pole(南 极)and the North Pole. The ice will melt. The sea level will rise by about 7 meters. As a result, water will cover cities like London, Tokyo and New York. Some ports(港口）and towns along the coasts will disappear under the water.
Some other scientists think that the dust, smoke and pollution from coal, wood and
oil fires will block out the sunrays. Then the earth will become colder and much ice will cover Europe and North America.
When chemicals in the air mix with rain,we have acid(酸）rain. Acid rain can bring us great harm. It destroys forests and kills life in lakes and rivers. People are beginning to see how serious the problem is. They find it important to work with nature instead of against it. They are trying to save the earth in many different ways. But one of the most important things to do is to make people understand that saving the earth is saving ourselves.
( )41. Some scientists believe that_.
A. the earth is growing warmer
B. we need coal in our forests
C. we can find oil in our forests
D. we have to burn down the forests every year
( )42. Ice at the poles will_if the earth gets warmer.
A. become thicker by seven meters
B. cover cities like London and Tokyo.
C. Raise the sea level by 7 degrees
D. become water and make the sea raise ( )43. Acid rain_.
A. brings great changes in our climate
B. kills pets in lakes and forests
C. kills the fish in rivers and lakes
D. will cover Europe and North America
( )44. What can we learn from the third paragraph?
A. The dust together with the pollution from coal，wood and oil fires will bring us more heat from the sun.
B. The sunrays will come more because of the dust and pollution from fires.
C. According to the scientists, the change in climate hardly has anything to d with the pollution.
D. As a result of the dust and pollution from coal,wood and oil fires,the earth will become colder.
( )45. Which statement is true?
A. The climate is changing just because of the acid rain.
B. People have come to know the importance of working with nature.
C. All the scientists agree that our earth is sure to become warmer and warmer.
D. The sea level will rise if the earth gets colder.
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