Carbon dioxide levels could double within the next half-century, warming the earth by as much as 4.5 degrees. The result? A partial melt-down of polar ice caps, raising sea levels as much as 24 feet; even 15 feet could threaten anyone living within 35 miles of the coast. Unbelievable? Maybe. But scientists warn that by the time we realise the severe effects of tropical deforestation, it will be 20 years too late.

　　Can tropical deforestation affect our everyday lives? Now, you should have got the answer.

　　11. The underlined word "synthetics" probably means

　　A. natural rubber

　　B. tropical materials

　　C. man-made material

　　D. commercial rubber

　　12. In the last paragraph the author tries to

　　A. tell people how to avoid the tropical deforestation

　　B. persuade people to buy something synthetic

　　C. show us how important it is to protect the tropical forests

　　D. let people realise the effect of tropical deforestation

　　13. According to the passage, which of the following is NOT true?

　　A. The forests are losing their function in turning carbon dioxide into oxygen.

　　B. Many of our daily uses are related to the tropical forests.

　　C. Tropical plants can be used to make industrial products.

　　D. High carbon dioxide levels will make the earth warmer.

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