Hydrogen fuel is green because it leaves only water when it burns. But producing it takes large amounts of energy. 1. Why is it difficult to get energy from sun? a. Because the sun doesn’t work at night. b. Because the sun often hides behind clouds. c. Because the sun doesn’t ...
【题目】The sun is a great energy source for Earth.But it's not easy to get its energy because the sun doesn't work at night, often hides behind clouds and, in some places, doesn't show up for months at a time. German scientists built the world's largest"artificial(人造的)sun" ...
The sun is a great energy source for Earth. But it’s not easy to get its energy because the sun doesn’t work at night, often hides behind clouds an in some places, doesn’t show up for mouths at a time. German scientists built the world’s largest “artificial (人造的) sun” ...
根据"hydrogen(氢气)is…agreenenergysource."可知是说氢气被认为是一种绿色能源,此处是sb./sth.beconsidered+名词/形容词"……被认为是……"。故选:A。【思路点拨】当作为燃料燃烧时,氢被认为是一种绿色能源。【解题思路】掌握单词的意思和用法,分析选项,结合句意选择正确答案。
[解析] [详解]句意:当作为燃料燃烧时,氢被认为是一种绿色能源。 考查动词辨析。considered认为;concluded推断出;completed完成;compared比较。根据“hydrogen(氢气) is…a green energy source.”可知是说氢气被认为是一种绿色能源,此处是sb./sth. be considered+名词/形容词“……被认为是……”。故选A。反馈...
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Also, when we take fossil fuel from the Earth, we often cause a lot of harm. Another problem is that we're running out of it. A big source of energy for many countries is nuclear power(核能).Thirty-one countries use nuclear power. A lot of ships also use it.Nuclear power has some...
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sight of something shiny and new, but a new study shows that we keep using our old devices (装置) well after they go out of style. That's bad news for the environment — and our wallets — as these outdated devices consume much more energy than the newer ones that do the same ...
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