【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...
Making solar panels make senseDanielle Ulman
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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...
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.
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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解析 科学家们在过去五年里做了很多实验,目的是让太阳能电池板更轻。所以正确答案是D。 1. 句子中“in the past 5 years”表示时间“在过去的五年里”,句子应该用现在完成时,故排除A、B选项。 2. 根据句意,科学家做实验的目的是为了让太阳能板更轻,应用比较级,故排除C选项。
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