2. 考研
  3. The population of the United States is only 6% the world’s population, but Americans (1)_____ one third of all the energy (2)___

The population of the United States is only 6% the world’s population, but Americans (1)_____ one third of all the energy (2)___

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问题     The population of the United States is only 6% the world’s population, but Americans (1)_____ one third of all the energy (2)_____ in the world. This fact alone says that Americans need to use less energy. And because the price of energy had been rising very rapidly (3)_____ the limited supplies of oil in particular, Americans are becoming aware to the need to (4)_____ energy. In California we have a California Energy Commission which has set up in the past five years to (5)_____ plan for our future energy rise. We have (6)_____ laws in California to help us conserve energy. First of all, our houses in California have been very (7)_____ of energy in the past. They were not (8)_____ very carefully and so the heat would go out of the house very rapidly. Now we require that the homes have a (9)_____ level of insulation, and so the homes built now are much more (10)_____.
     (11)_____, in transportation (12)_____ a large percentage of oil energy is used, we need to develop more public transportation. In China, of course, you have a very good public-transportation system. And it is a(n) (13)_____ for the kind of thing we need to develop more in the United States. Automobiles are also becoming more (14)_____ The smaller automobile with efficient engine can help to conserve a large amount of energy along with planning our (15)_____ more carefully.
    Many different studies have shown that we could (16)_____ our energy consumption by (17)_____ half or two thirds and still have the (18)_____ quality of life. And many different types of technologies are currently being researched as to (19)_____ they can be built to use (20)_____ energy and still supply the same service.

选项 A、where
B、why
C、when
D、how
答案D
解析 上下文理解题。as to意思是"关于…"，本句话的意思是"关于如何使用少的能源而又提供同样服务的许多不同类型的技术现在正处于研究中"，从上下文及意思上判断，how是正确答案。
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