2. 外语
  3. If the sun has enough【C1】______to warm and light the whole earth, it must have enough power to do other things,【C2】______. Can w

If the sun has enough【C1】______to warm and light the whole earth, it must have enough power to do other things,【C2】______. Can w

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问题    If the sun has enough【C1】______to warm and light the whole earth, it must have enough power to do other things,【C2】______. Can we use the sun’s【C3】______energy to supply electricity, or at least to perform the function which electricity or other types of power usually perform? The answer is【C4】______.
   For example, people have for many years been using the【C5】______heat of the sun to cook by solar【C6】______which have been built with several incurred【C7】______reflecting the sun and focusing the heat on the cooking element. This【C8】______can be used like a gas or electric stove; it is more expensive to make but it doesn’t need any【C9】______and so costs【C10】______to use. Another【C11】______of using solar energy is in house heating.
   The【C12】______of energy we use most is electricity, and every day more is【C13】______. But electricity has to be made too, and to make it huge quantities of fuel is required -- oil, coal, gas and nowadays even uranium.
   The question which【C14】______everyone today is: how long will these fuels【C15】______? Nobody knows it for sure,【C16】______most experts think it will soon be difficult to obtain sufficient electricity from these sources. It is possible that the sun can make a(n)【C17】______here, too.
   Solar power has already been used to produce【C18】______heat. In Southern France a solar furnace has been built,【C19】______temperatures reach more than 3 000 centigrade. This furnace is not only used for experiment【C20】______, but could be used to produce steam for a power station.
【C13】
选项 A、worth
B、brought
C、needed
D、expensive
答案C
解析 考查上下文理解。be worth值得；bring带(来)，携带；need需要；expensive昂贵的。虽然四个选项填入在语法上来说都对，但由下文文意及常识可知作者这里是指我们每天需要的电能越来越多，所以选 [C] 。其余三项在意思上都与文意无关。
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