Comfortable lives require a lot of energy, including electricity, gas, and gasoline. Generating electricity and operating machines by burning fuels like oil and coal releases carbon dioxide and other gases into the air, and causes problems like global warming and air pollution.

　　Global warming is a problem. In order to prevent it, the amount of carbon dioxide and other greenhouse gases must be reduced. Japan is actively developing and introducing clean energy as part of its efforts to deal with global warming and cut pollution.

　　51. The underlined word “this” in the first paragraph means ________.

　　A. air pollution

　　B. using things once and then throwing them away

　　C. global warming

　　D. protecting environment

　　52. According to the passage, which of the following causes air pollution?

　　A. Released gases

　　B. Oil and coal

　　C. Electricity and fuels

　　D. New machines

　　53. The world gets warmer and warmer mainly because________.

　　A. fewer and fewer gases such as carbon dioxide are released

　　B. there are more and more people in the world

　　C. agriculture is becoming more and more important

　　D. industry has been developed

　　54. Which isn’t mentioned in the passage?

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