【正文】 h light. So the blue light gets bounced all over the sky and looks like it39。s still some green and even blue light hidden in there, just far less than the other colors. But for us to notice the remaining green light, it needs to hit something that reflects green light much better than red. That39。 Big tall threatening storm clouds are made of water droplets, and even though water is best at reflecting blue light, it can still reflect green pretty well, much better than reds and oranges, so under just the right conditions, the water in and around a cloud can bounce the green light hidden in the sunset right into our eyes making the sky look green.t necessarily mean there39。Why Do the Central United States Get TornadoesB.A Common Piece of Celestial FortunetellingD.Because only blue light can be bounced in the daytime.B.Because blue light is bounced all over the sky.D.The sunset.B.Blue light.D.Storm clouds are made of water droplets and green light.B.There are only red and orange lights in the sunsets.D. （1）考查主旨大意。s a mon piece of celestial （天上的）fortunetelling that green skies mean a tornado is on its way.”和最后一段中的“Still, none of the conditions that can turn skies green are unique to the clouds that produce tornadoes. Sometimes they just lead to lots of rain, and maybe some hail.”可知，本文主要話題是關注綠色的天空是否意味著即將來臨的龍卷風展開的，故選B。根據(jù)第二段中的“Daytime skies are blue because blue shorter wavelengths of visible light tend to bounce off （反 射）air molecules better than red longer wavelength light.”可知，白天天空是藍色,因為藍色短的波長的可見光會反射空氣分子比紅色的長波長光。 （3）考查代詞指代。s still some green and even blue light hidden in there, just far less than the other colors.”可知，選A。根據(jù)第三段中的“But for us to notice the remaining green light, it needs to hit something that reflects green light much better than red. That39。 【點評】本題考點涉及細節(jié)理解，代詞指代，推理判斷和主旨大意四個題型的考查，是一篇科普類閱讀，要求考生在捕捉細節(jié)信息的基礎上，進一步根據(jù)上下文的邏輯關系，進行分析，推理，概括和歸納，從而選出正確答案。 You know those nutrition guidelines the government issues every few years? It turns out that following them isn39。s good for the planet, too.impact nations, in general, you can see that, if you follow a nationally remended diet, despite the fact that these diets don39。t explicitly mention—environmental impacts, that you are going to have lower environmental impacts due to that. So that39。ine nations. said Paul Behrens, an environmental scientist at Leiden University in the Netherlands.free land on Earth is used for agriculture, and according to some estimates, producing food accounts for roughly a fifth of all human173。 However, following dietary guidelines would reduce those impacts, especially in wealthy countries like the US. Most of the reductions e from meat and dairy, which have an outsized impact on land use and pollution, and are a major source of greenhouse gases.(That39。 Overall, in high173。s team estimates that following the rules could result in as much as a 17 percent reduction in land use, a 21 percent reduction in nutrient pollution, and a 25 percent drop in agricultural greenhouse gas emissions. Cutting down on how much food we waste—which is roughly a third in the US—could help even more. The results are in the Proceedings of the National Academy of Sciences.on effect on other areas of policy making. So if I39。eating173。schools program then that39。 It seems that a smaller environmental footprint and a healthier lifestyle could go hand in hand.（1）Which of the following statement will Paul Behrens approve of? A.Following a nationally remended diet can do good to our health.C.Some high173。t mention the diet explicitly for its impacts can be ignored.（2）What do the underlined words takes a big toll on shows signs ofhas a bad effect ontakes full advantage ofmakes up for（3）Which of the following is TRUE according to the passage? A.caused greenhouse gas with only a third of the ice173。It is estimated that following dietary guidelines can lead to decrease in more land use than in nutrient pollution.C. new program concerning healthy eating for schools is likely to be based on national nutrition guidelines.D.t effected much.【答案】 （1）C（2）B（3）A 【解析】【分析】本文是一篇說明文，介紹了營養(yǎng)指南對地球也有利。 （1）考查推理判斷。impact nations, in general, you can see that, if you follow a nationally remended diet, despite the fact that these diets don39。t explicitly mention—environmental impacts, that you are going to have lower environmental impacts due to that.” 我們發(fā)現(xiàn)（營養(yǎng)膳食指南的）影響因國家而異，但總的來說，在影響力較大的國家，如果你遵循國家推薦的膳食指南，即使這些膳食并未明晰對環(huán)境的影響，或者大多數(shù)膳食沒有明確說明這一點，但是你對環(huán)境的影響會因為遵循指南而減輕。 （2）考查詞義猜測。free land on Earth is used for agriculture, and according to some estimates, producing food accounts for roughly a fifth of all human173。肥料徑流也導致了其他問題，例如伊利湖的藻類爆發(fā)以及墨西哥灣的死亡區(qū)域。takes a big toll on固定短語，“付出了巨大的代價”，故選B。根據(jù)第三段中的“A third of the ice173。caused greenhouse gas emissions.”地球上三分之一的無冰區(qū)被用于農(nóng)業(yè)生產(chǎn)，根據(jù)一些估算，食物生產(chǎn)大約占到了人類造成的溫室氣體排放量的五分之一。A選項的描述 糧食生產(chǎn)可導致約20%的人為造成的溫室氣體，而只使用了三分之一的無冰土地 正確，故選A。5．閱讀理解 re being eaten alive within minutes of stepping outdoors. re not alone. According to Smithsonian Magazine, around 20 percent of people in the world are especially tasty to mosquitoes. What about these people makes mosquitoes39。A popular myth claims that mosquitoes prefer certain blood types, but the fact is that they simply can39。s not plicated. The two most important reasons a mosquito is attracted to you have to do with sight and smell. s why you monly find them in crowded streets and parks. As a result, people who simply exhale (呼出) more of the gas over time – generally, larger people – have been shown to attract more mosquitoes than others. This is why kids don39。This love for CO2 can also put pregnant women at increased risk for mosquito bites, as they tend to exhale 21 percent more CO2 than people of the same age and size who aren39。In addition to carbon dioxide, the color of the clothes you wear also plays a role in attracting mosquitoes. Being