Overall, safety should be the top priority when installing solar panels. Taking appropriate precautions can ensure that the installation process is safe and that the solar panel system is always operating at pea
Making solar panels make senseDanielle Ulman
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Solar panels should last you 25 years or more. To get there, you'll need to find a reputable installer and perform some basic maintenance.
【答案】C【核心短语/词汇】inthepast 5 years:在过去的5年里【翻译】在过去的5年里,科学家们已经做了许多测试使太阳能电池板更轻。【解析】根据句意,可知此题考查时态和比较级,inthepast 5 years:在过去的5年里,是现在完成时的标志词,因此应用现在完成时,have/has+过去分词,根据选项,A.一般过去时,B.一般...
1. Keep 'em Clean Oh solar panels—they work so well that you hardly notice that they're there. And there is the problem. While the systems are quiet (silent, in fact, except for maybe the inverter), and run without you ever needing to touch them, when you get a bill at the end...
A 选项 “did” 是一般过去时;C 选项 “have done” 是现在完成时。“in the past 5 years”(在过去的 5 年里)是现在完成时的标志性时间状语,表示从过去持续到现在的一段时间,所以这里要用现在完成时,A 选项不符合,C 选项 “have done” 正确。再看第二空:B 选项 “lighter” 是“light(轻的)” ...
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( )31. Scientists ___ many tests to make solar panels ___ in the past 5years. A. did; light B. did; lighter C. have done; light D. have done; lighter 相关知识点: 试题来源: 解析 【答案】D【核心短语/词汇】light:轻的【翻译】在过去的5年里,科学家们已经做了许多测试,使太阳能电...