【正文】 and the Dead Zone in the Gulf of Mexico.t mention explicitly—or most of them don39。根據(jù)最后一段中的“Future work will continue to focus on ameliorating the accuracy of identifying objects and imaging shapes and volumes”今后的工作將繼續(xù)側(cè)重于提高識別物體和成像形狀及體積的準(zhǔn)確性，故選B。s in airports. Manpower is always needed to check bags and we want to develop a method to try to reduce manpower.” （2）考查細(xì)節(jié)理解。Examining.【答案】 （1）B（2）D（3）A（4）B 【解析】【分析】本是一篇說明文，介紹了研究人員發(fā)現(xiàn)，WiFi可用于可用于安檢。To research dangerous objects.（4）Which of the following can replace the underlined word “ameliorating in the last paragraph? A.B. signals.D.s the advantage of the device? A.s a growing need for that now. In large public areas, it39。 When it was tested on a backpack, the accuracy rate topped 95 percent. But the accuracy dropped to about 90 percent when objects inside bags are wrapped. And the tech could save lives if used in museums, stadiums, theme parks or schools, the team said, noting its design can inspect bags or luggage without being an exposure to privacy.2．犇犇閱讀理解 （4）考查推理判斷。根據(jù)第三段中的“The calving of A68 provides us with a unique opportunity to study marine life...”可知A68冰山的形成為科學(xué)家提供了研究海洋生物的獨(dú)一無二的機(jī)會，所以Professor David Vaughan認(rèn)為科學(xué)家要果敢地抓住這次機(jī)會，故this one指的是A68冰山和它下面的生態(tài)系統(tǒng)。 （1）考查細(xì)節(jié)理解。The ice sheets in Greenland and Antarctica are melting at a steady rate.C.It is part of an ice shelf in the Arctic.C.Climate change in Antarctica.C.To study a newly discovered ecosystem.C.s biggest iceberg in a mission aiming to answer fundamental questions about the impact of climate change in the polar regions. The scientists, led by the British Antarctic Survey (BAS), are trying to reach a newly revealed ecosystem that had been hidden for 120,000 years below the Larsen C ice shelf. Professor David Vaughan, science director at the BAs, said, We need to be bold (大膽的) on this one. Larsen C is a long way south and there39。 There is growing concern about the possible impact of climate change in the Antarctic. Earlier this month, a report revealed that melting ice sheets in Greenland and Antarctica are speeding up the already fast pace of the sea level rise. The research, published by the National Academies of Science, Engineering and Medicine, said, At the current rate, the world39。To explore a new way to prevent climate change.D.The A68 iceberg with the ecosystem beneath it.D.It will disappear in a very short time.D.Many creatures living in deep water will die out due to climate change.D.根據(jù)第二段中的“Now scientists say it is a race against time to explore these new ecosystems before they are transformed to the light.”可知，科學(xué)家著急趕去世界最大的冰山是為了在其受到光照影響之前研究這座冰山下面的海洋生態(tài)系統(tǒng)。故選C。根據(jù)最后一段中的“…At the current rate, the world39。 The detection system analyzes what happens when wireless signals go through and bounce off objects or materials. The approach, which the paper states, works by separating the wireless interference(干擾)caused by two factors of objectsthe material and shape. Most dangerous objects such as weapons are usually metal or liquid, which have significant interference, researchers said.s hard to set up expensive screening equipment like what39。 The peerreviewed study, which recently won a best paper award at the 2018 IEEE Conference on Communications and Network Security, is now published online. Future work will continue to focus on ameliorating the accuracy of identifying objects and imaging shapes and volumes, researchers said.（1）What does paragraph 3 talk about? A.B.It saves people in danger of natural disasters.B.It protects personal information from being disturbed.（3）Why did the researchers study the device according to Yingying Chen? A.To make full use of WiFi.C.Confirming.B. （1）考查段落大意。根據(jù)第四段中的“noting its design can inspect bags or luggage without being an exposure to privacy.”可知，不用打開和檢查人們的個人物品，避免了侵犯隱私，可知選D。在大型公共場所，很難像機(jī)場那樣設(shè)置昂貴的安檢設(shè)施。 【點評】本題考點涉及細(xì)節(jié)理解，詞義猜測，推理判斷和段落大意四個題型的考查，是一篇科研類閱讀，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。 You know those nutrition guidelines the government issues every few years? It turns out that following them isn39。t explicitly mention—environmental impacts, that you are going to have lower environmental impacts due to that. So that39。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。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.Some high173。shows signs ofhas a bad effect ontakes full advantage ofmakes up for（3）Which of the following is TRUE according to the passage? A.It is estimated that following dietary guidelines can lead to decrease in more land use than in nutrient pollution.C.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。impact nations, in general, you can see that, if you follow a nationally remended diet, despite the fact that these diets don39。 （2）考查詞義猜測。肥料徑流也導(dǎo)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。根據(jù)第三段中的“A third of the ice173。A選項的描述 糧食生產(chǎn)可導(dǎo)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。 Shining iridescent color, which changes depending on the angle from which it39。 And in our research group we are of course interested in why this vivid metallic color is so widespread in nature. Karin Kjernsmo of the University of Bristol adds that in some cases the showy splashes of light are a sexual strategy. Here I would like to point out that in some species, particularly those that display st