单选题 21. Almost all forms of large-scale electric power generation pollute the environment; the less electric power consumed, therefore, the less pollution created. Ordinary refrigerators account for 15 percent to 25 percent of the average United States household's annual electric power consumption, but energy efficient refrigerators use 20 percent to 30 percent less electricity than ordinary refrigerators.
If the information above is correct, which of the following conclusions does it best support? ______

A、 The increasingly widespread use of energy efficient refrigerators will ensure that less pollution will be produced twenty years from now than is currently being produced.
B、 United States household energy consumption could be reduced by 20 percent to 30 percent if all households were to replace their current refrigerators with energy-efficient models.
C、 In the future, people will buy smaller refrigerators and will keep a smaller percentage of food items refrigerated.
D、 The replacement of ordinary refrigerators with energy-efficient refrigerators can help reduce the amount of new pollution created.
E、 Energy-efficient refrigerators often cost substantially more money than do ordinary refrigerators.

【正确答案】 A

【答案解析】 A：该选项和原文结论一致。正确。
B：该结论能够成立的前提是，现在美国所有家庭的冰箱都是普通冰箱。但是文章没说有多少家庭现在用的是普通冰箱，多少家庭是节能冰箱，因此该结论未必成立，不选。
C：食物属于文章以外信息，不选。
D：新污染物属于原文以外信息，不选。
E：花费属于原文以外信息，不选。