【文章內(nèi)容簡(jiǎn)介】 ”故選A。 （2）考查詞義猜測(cè)。根據(jù)第二段中的“and that is to say, it is a sign of tim”也就是說，這是時(shí)間的標(biāo)志，”可知，劃線詞的意思是“標(biāo)志，象征”。故選C。 （3）考查推理判斷。根據(jù)第三段中的“This is notable because panies such as Apple are reportedly developing AR glasses to assist — or perhaps even replace — smartphones.”這一點(diǎn)值得注意，因?yàn)閾?jù)報(bào)道，蘋果(Apple)等公司正在開發(fā)增強(qiáng)現(xiàn)實(shí)眼鏡，以幫助——甚至取代——智能手機(jī)?！?可知，我們可以從文中推斷，科技公司將面臨智能手機(jī)可能被取代的事實(shí)。故選D。 （4）考查推理判斷。根據(jù)最后一段中的“But don39。t get too excited. There39。s still a lot of work to be done in the meantime, including various trials to make sure the radios play nicely with hardware and infrastructure construction so 5G isn39。t concentrated only in big cities.”但是不要太激動(dòng)。與此同時(shí)，仍有很多工作要做，包括各種試驗(yàn)，以確保收音機(jī)能很好地配合硬件和基礎(chǔ)設(shè)施建設(shè)，這樣5G就不會(huì)只集中在大城市?！笨芍髡呓酉聛砜赡軙?huì)告訴我們“如何全面擴(kuò)大5G覆蓋?！惫蔬xA。 【點(diǎn)評(píng)】本題考點(diǎn)涉及段落大意，詞義猜測(cè)和推理判斷三個(gè)題型的考查，是一篇科普類閱讀，要求考生根據(jù)上下文的邏輯關(guān)系，進(jìn)行分析，推理，概括和歸納，從而選出正確答案。4．犇犇閱讀理解 In areas like the Central United States that get lots of tornadoes, there39。s a mon piece of celestial （天上的）fortunetelling that green skies mean a tornado is on its way. Research has shown that it isn39。t quite as simple as that, but scientists have found that if you see a green sky, you should probably go inside. As far as most scientists can tell, the green skies around powerful thunderstorms are usually a bination of red sunsets and water droplets. 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. So the blue light gets bounced all over the sky and looks like it39。s ing from everywhere. Meanwhile, around sunset sunlight travels through so much atmosphere that just about all the blue is bounced away from the horizon, leaving all those reds and oranges behind. The sunset might look exclusively （獨(dú)有的）red and orange, but there39。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。s where water es in. 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. 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. So if you see huge storm clouds rolling in and a green tint （色調(diào)）in the sky, it doesn39。t necessarily mean there39。s about to be a tornado, but it does mean you should probably head indoors.（1）What can be the best title for the text? A.Why Do the Central United States Get TornadoesB.Do Green Skies Mean a Coming TornadoC.A Common Piece of Celestial FortunetellingD.Green Skies Are Unique to Clouds（2）Why are the skies blue in the daytime? A.Because only blue light can be bounced in the daytime.B.Because there is more blue light than light of other colors.C.Because blue light is bounced all over the sky.D.Because red light is weaker than blue light.（3）What does the underlined word it in paragraph 2 refer to? A.The sunset.B.Red light.C.Blue light.D.Water.（4）What can we learn about from the text? A.Storm clouds are made of water droplets and green light.B.Water can reflect red light as well as blue light.C.There are only red and orange lights in the sunsets.D.If you see a green sky, there will be a tornado.【答案】 （1）B（2）C（3）A（4）B 【解析】【分析】本文是一篇說明文，科學(xué)家發(fā)現(xiàn)天空呈現(xiàn)綠色并不是產(chǎn)生龍卷風(fēng)的云層所獨(dú)有的，有時(shí)它們會(huì)導(dǎo)致大量降雨，甚至冰雹，待在室內(nèi)或許是最好的選擇。 （1）考查主旨大意。通讀全文，根據(jù)第一段中的“there39。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(guān)注綠色的天空是否意味著即將來臨的龍卷風(fēng)展開的，故選B。 （2）考查細(xì)節(jié)理解。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(lán)色,因?yàn)樗{(lán)色短的波長(zhǎng)的可見光會(huì)反射空氣分子比紅色的長(zhǎng)波長(zhǎng)光。故選C。 （3）考查代詞指代。根據(jù)第二段中的“The sunset might look exclusively （獨(dú)有的）red and orange, but there39。s still some green and even blue light hidden in there, just far less than the other colors.”可知，選A。 （4）考查推理判斷。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。s where water es in.”可知，水既能反射藍(lán)光，也能反射紅光，故選B。 【點(diǎn)評(píng)】本題考點(diǎn)涉及細(xì)節(jié)理解，代詞指代，推理判斷和主旨大意四個(gè)題型的考查，是一篇科普類閱讀，要求考生在捕捉細(xì)節(jié)信息的基礎(chǔ)上，進(jìn)一步根據(jù)上下文的邏輯關(guān)系，進(jìn)行分析，推理，概括和歸納，從而選出正確答案。5．犇犇閱讀理解 You know those nutrition guidelines the government issues every few years? It turns out that following them isn39。t just good for your health. It39。s good for the planet, too. What we found is that impacts vary across nations, but in the high173。impact nations, in general, you can see that, if you follow a nationally remended diet, despite the fact that these diets don39。t mention explicitly—or most of them don39。t explicitly mention—environmental impacts, that you are going to have lower environmental impacts due to that. So that39。s sort of fairly clear across all the high173。ine nations. said Paul Behrens, an environmental scientist at Leiden University in the Netherlands. The food we eat takes a big toll on the environment. A third of the ice173。free land on Earth is used for agriculture, and according to some estimates, producing food accounts for roughly a fifth of all human173。caused greenhouse gas emissions. Fertilizer runoff also leads to other problems, like the algae blooms in Lake Eerie and the Dead Zone in the Gulf of Mexico. However, following dietary guidelines would reduce those impacts, especially in wealthy countries like the US. Most of the reductio