【正文】 f the blackboard.D.回答了黑板為什么是綠色的？這個(gè)問題。根據(jù)第一段中的，...late 18thcentury students used their own mini boards made of slate (石板) or painted wood...可知，18世紀(jì)的學(xué)生用的是“迷你板”。 （2）考查推理判斷。In 1800 when a Scottish headmaster named James Pillans wanted his students to draw maps, the students couldn39?？芍?，校長(zhǎng)讓學(xué)生把他們的迷你板拼湊在一起是為了創(chuàng)造一個(gè)大的空間來(lái)畫地圖。 （3）考查細(xì)節(jié)理解。故選D。文章第一段前四句話點(diǎn)明了文章中心：我們看到的黑板大多是綠色的，為什么叫黑板？通讀全文也可知文章主要講述了黑板發(fā)展過程中顏色從黑色變成綠色的過程和原因。 【點(diǎn)評(píng)】本題考點(diǎn)涉及細(xì)節(jié)理解，推理判斷和主旨大意三個(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。 Slowly but surely re moving closer and closer to 5G world. From smarthome security to selfdriving cars, all the internetconnected devices in your life will be able to talk to each other at lightningfast speeds with reduced delay, Objectively speaking, the fastest 4G download speeds in the U. S. top out at an average of Mbps. But by parison 5G promises gigabit (千兆) speeds.s pulling in data from other vehicles about road conditions down the lane. It could be weather information, but also connected infrastructure (基礎(chǔ)設(shè)施) construction. There39。 Augmented reality glasses and virtual headset haven39。 Ericsson stated at February39。 But don39。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。The lightingfast speed of 5G.B.The difference between 4G and 5G.D.Exhibition.B.Symbol.D.5G world won39。5G helps to create the artificial intelligence vehicleC.Tech panies will face the fact that smartphones may be replaced（4）What will the author probably tell us next? A.Smart glasses will bee faster and lighter.C.t concentrated in big cities.D. （1）考查段落大意。re moving closer and closer to 5G world.”緩慢但肯定的是，我們離5G世界越來(lái)越近了?！惫蔬xA。根據(jù)第二段中的“and that is to say, it is a sign of tim”也就是說(shuō)，這是時(shí)間的標(biāo)志，”可知，劃線詞的意思是“標(biāo)志，象征”。 （3）考查推理判斷?！?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)。 （4）考查推理判斷。t get too excited. There39。t concentrated only in big cities.”但是不要太激動(dòng)?！笨芍髡呓酉聛?lái)可能會(huì)告訴我們“如何全面擴(kuò)大5G覆蓋。 【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。 If plastic had been invented when the Pilgrims sailed from Plymouth, England, to North Americaand their Mayflower had been stocked with bottled water and plastic wrapped snacks, their plastic waste would likely still be around four centuries later. Atlantic waves and sunlight would have worn all that plastic into tiny bits. And those bits might still be floating around the world39。 Because plastic wasn39。 No one knows how much unrecycled plastic waste ends up in the ocean, the earth39。s attention with a rough estimate between million and 14 million tons of plastic waste each year just e from coastal regions. This isn39。t know what the solution is, says Ted Siegler, a Vermont resource economist who has spent more than 25 years working with developing nations on garbage. We know how to pick up garbage. Anyone can do it. We know how to deal with it. We know how to recycle. It39。To prove plastic was difficult to invent.B.To tell the Pilgrims contributed a lot to the marine protection.D.s the main trouble marine animals face according to the text? A.Being stuck by plastics.C.Treating plastics as food.（3）What does Ted Siegler want to tell us in the last paragraph? A.t know the solution of plastics waste.B.It39。People should avoid using plastics to protect the ocean.（4）From which is the text probably taken? A.B.An environmental report.D. （1）考查推理判斷?！彼麄兊乃芰蠌U物很可能在四百年后仍會(huì)存在，可知 作者提到the Pilgrims是為了說(shuō)明塑料廢物對(duì)海洋有持久的影響，故選D。根據(jù)第四段中的“Some are harmed visibly, stuck by abandoned things made of plastic. Many more are probably harmed invisibly.”一些明顯受到傷害，被塑料制成的廢棄物品卡住了。可知選B。根據(jù)最后一段中的“It39。 （4）考查推理判斷。是一篇環(huán)境保護(hù)類閱讀，因此選C。5．犇犇閱讀理解 Having conducted previous research in 2017 revealing that eating similar foods led to people feeling emotionally closer to one another, Dr Woolley and Dr Fishbach wondered whether the way in which food was served also had a psychological effect. They theorized that, on the one hand, sharing food with other people might indicate food scarcity（短缺）and increase a feeling of petition. However, they also reasoned that it could instead lead people to bee more aware of others39。 For the first test they recruited 100 pairs of participants from a local cafe, none of whom knew each other. The participants were seated at a table and fed tortilla chips with salsa. Half the pairs were given their own basket of 20 grams of chips and a bowl of 25 grams of salsa, and half were given 40 grams of chips and 50 grams of salsa to share. As a cover for the experiment, all participants were told this snack was to be consumed before the game began. The researchers measured cooperation by noting the number of rounds it took to reach an agreement, and found that those who shared food resolved the strike significantly faster（in 8. 7rounds）than those who did not（ rounds）. A similar experiment was conducted with 104participants and Goldfish crackers（餅干）, this time negotiating an airline39。A meal taken at home.B.A meal consumed by oneself.A meal taken in a family atmosphere.（2）For what purpose did the researchers carry out the present experiments? A.To prove sharing food increases petition.C.To find out whether sharing food can get people close emotionally.（3）Why were participants asked to eat up the snack before the game? A.B.To hide the intention of the experiment.To avoid the distraction during the game.【答案】 （1）B（2）C（3）C 【解析】【分析】本文是一篇說(shuō)明文，介紹了外交宴席的心理學(xué) （1）考查細(xì)節(jié)理解。 needs and drive cooperative behavior as a result.”他們形成了一套理論，認(rèn)為一方面，與他人一起吃飯可能表明糧食短缺，并加強(qiáng)了競(jìng)爭(zhēng)的概念。可知familystyle指的是與別人一起用餐，故選B。根據(jù)第二段中的“However, they also reasoned that it could instead lead people to bee more aware of others39。然而，他們