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We are now used to wearing masks in public to prevent getting the flu（流感）, especially in spring and winter. It’s reported that about 300 million masks are used and then thrown away every day in China. Where do these used masks go? You might think that they just go into a rubbish bin. But that’s just the first stop on the mask journey. After the masks are thrown into bins, rubbish trucks empty the bins and take them to landfills（垃圾场）. Next, the masks will be dumped into rubbish incinerators（焚化炉）and burned. Won’t it cause pollution?
The answer is “no”. That’s because most masks are made of an environmentally-friendly material. It can break down easily. After burning, it turns into water and carbon dioxide（二氧化碳）. As long as landfills are properly cleaned and deal with their emissions（排放）correctly, burning masks won’t cause pollution.
In fact, burning the masks can bring some good things. Burning rubbish can produce electricity（电）. Burning one ton of rubbish can produce more than 400 W of electricity. Some people think there will be 162 000 tons of used masks in China this year. Burning all of them can produce 64 million kilowatt-hours of electricity. This is enough to allow an electric car to drive 370 million kilometres, which is 9 250 times around the earth. In addition, the leftover from burning masks can be recycled into bricks or roadbeds.
（ ）1. Burning masks won’t cause pollution because _______.
A. most masks are made of water and carbon dioxide
B. most mask materials are environmentally friendly
C. burning masks needs no time
D. burning masks won’t cause any emissions
（ ）2. In Paragraph 2, the underlined word “it” means a(n) _______.
A. mask B. rubbish truck
C. rubbish bin D. environmentally-friendly material
（ ）3. What are the benefits（益处）of burning masks?
a. It can make electricity. b. It can help us save water.
c. Leftover can be used to make bricks. d. It reduces carbon dioxide emissions.
A. a b B. a c C. b c D. c d
（ ）4. Which could be the best title for the passage?
A. Where Do Our Used Masks Go?
B. Ways to Deal With Used Masks.
C. The Number of Used Masks in China.
D. How Should We Throw Away Used Masks?
The answer is “no”. That’s because most masks are made of an environmentally-friendly material. It can break down easily. After burning, it turns into water and carbon dioxide（二氧化碳）. As long as landfills are properly cleaned and deal with their emissions（排放）correctly, burning masks won’t cause pollution.
In fact, burning the masks can bring some good things. Burning rubbish can produce electricity（电）. Burning one ton of rubbish can produce more than 400 W of electricity. Some people think there will be 162 000 tons of used masks in China this year. Burning all of them can produce 64 million kilowatt-hours of electricity. This is enough to allow an electric car to drive 370 million kilometres, which is 9 250 times around the earth. In addition, the leftover from burning masks can be recycled into bricks or roadbeds.
（ ）1. Burning masks won’t cause pollution because _______.
A. most masks are made of water and carbon dioxide
B. most mask materials are environmentally friendly
C. burning masks needs no time
D. burning masks won’t cause any emissions
（ ）2. In Paragraph 2, the underlined word “it” means a(n) _______.
A. mask B. rubbish truck
C. rubbish bin D. environmentally-friendly material
（ ）3. What are the benefits（益处）of burning masks?
a. It can make electricity. b. It can help us save water.
c. Leftover can be used to make bricks. d. It reduces carbon dioxide emissions.
A. a b B. a c C. b c D. c d
（ ）4. Which could be the best title for the passage?
A. Where Do Our Used Masks Go?
B. Ways to Deal With Used Masks.
C. The Number of Used Masks in China.
D. How Should We Throw Away Used Masks?
答案
1 - 4 BDBA
