2. 外语
  3. For many people, electricity is a vital part of everyday life and is often taken for granted. But not everyone has【B1】______ to

For many people, electricity is a vital part of everyday life and is often taken for granted. But not everyone has【B1】______ to

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问题       For many people, electricity is a vital part of everyday life and is often taken for granted. But not everyone has【B1】______ to it. Improving the supply and availability of electricity across the world has【B2】______ scientists for decades. Now, however, technological advances mean that a cheap, safe【B3】______ of electricity may soon be available virtually anywhere on the planet.
     The idea is to harness the sun’s energy by using satellites. Of course, solar-powered satellites are not a new idea. But it is only【B4】______ recently that technology has advanced far enough to make the idea a【B5】______ possibility.
     The basic idea is that the solar-powered satellites will【B6】______ the energy in sunlight into electricity. The energy will be【B7】______ to earth in the form of microwaves, which will be collected by a【B8】______ known as a microwave collector. A re-conversion plant【B9】______ . The type of solar-powered satellites is able to produce electricity extremely efficiently, with less absorption and scattering of radiation. Each solar panel used for harnessing solar energy will be only 200 metres long, and also very light in weight.【B10】______ .
     Scientists are anxious to reassure people about the safety of microwaves.【B11】______ . However, if the microwaves operate at the correct frequencies, scientists assure us that people and the environment should both be safe.
【B2】
选项
答案challenged
解析 该句缺少一个谓语动词。助动词have/has/ had之后的动问形式只能是过去分词，听写时即使没听清楚-ed．也要写对形式。
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