分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了太阳对我们的重要作用,仔细讲述了太阳光对地球的影响等信息.
解答 67.A.细节理解题.根据第三段These gases act like the glass of a greenhouse in that they allow energy from the Sun to enter but prevent energy from leaving.They are therefore called greenhouse gases可知大气中发现的许多气体被称为温室气体因为他们执行相同的功能作为温室的玻璃,故选A.
68.A.细节理解题,根据第一段The Sun is the major source of energy for our planet可知,地球上天气变化的根源在于太阳能;故选A.
69.B.细节理解题,从文章第二段Much of the energy that comes from the Sun never reaches the Earth's surface可知,太阳能只有小部分才能到达地表,大多被表层大气所反射或吸收.只有B项才概括全面.其中lose一词用的恰到好处,可以涵盖reflect和absorb之意.故选B.
70.D.推理判断题,从文章第一段Sunlight also provides the energy used by green plants to make their own food.These green plants then provide food for all organisms(生物) on the Earth可知,地球上所有生物均要依靠太阳能来间接为他们提供食物.故选D.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
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