【文章內(nèi)容簡介】 timate the volume of liquids such as water, acid, alcohol and other chemicals for explosive material. The study led by researchers at the Wireless Information Network Laboratory (WINLAB) in the School. of Engineering showed a wireless device with two to three antennas(天線)that could be fitted in existing WiFi networks. 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. 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. It uses channel state information (CSI) that is readily available in lowcost WiFi devices. This could have a great impact on protecting the public from dangerous objects, said Yingying Chen, a coauthor of the study, There39。s a growing need for that now. In large public areas, it39。s hard to set up expensive screening equipment like what39。s in airports. Manpower is always needed to check bags and we want to develop a method to try to reduce manpower.” 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.The function of the technique.B.The way the device works.C.The principle the study is based on.D.The benefit of the study findings.（2）What39。s the advantage of the device? A.It saves people in danger of natural disasters.B.It passes through bags without damaging them.C.It uses antennas to pick up networks39。 signals.D.It protects personal information from being disturbed.（3）Why did the researchers study the device according to Yingying Chen? A.To save money and labour.B.To make full use of WiFi.C.To protect passengers39。 privacy.D.To research dangerous objects.（4）Which of the following can replace the underlined word “ameliorating in the last paragraph? A.Confirming.B.Improving.C.Discovering.D.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。 （1）考查段落大意。根據(jù)第三段中的“The detection system analyzes what happens when wireless signals go through and bounce off objects or materials.”這個檢測系統(tǒng)分析信號在物體和材料上穿透和反射時會發(fā)生什么。可知選B。 （2）考查細節(jié)理解。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。 （3）考查推理判斷，根據(jù)第五段中的“In large public areas, it39。s hard to set up expensive screening equipment like what39。s in airports. Manpower is always needed to check bags and we want to develop a method to try to reduce manpower.”在大型公共場所，很難像機場那樣設(shè)置昂貴的安檢設(shè)施。檢查行李總是需要人力，我們希望開發(fā)一種互補的方法來減少人力，可推知選A。 （4）考查詞義猜測。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確性，故選B。 【點評】本題考點涉及細節(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，要求考生在捕捉細節(jié)信息的基礎(chǔ)上，進一步根據(jù)上下文的邏輯關(guān)系，進行分析，推理，概括和歸納，從而選出正確答案。5．犇犇Choose the one that fits best according to the information given in the passage you have read. Stocky, slowmoving whale, rarely grows beyond 15 metres in length Flippers are a third of body length。 variable dorsal fin size and shape。 sawtoothed trailing edge on flukes, often raised when diving Bumpy tubercles on top of head Body colour is dark brown to black。 often extensive white on flippers and underside of body and flukes。 such patterns enable individual recognition Bushy blow, occasionally Vshaped 270400 olive baleen plates Humpback whales belong to the rorqual (groovethroated) family, which includes fin, sei, Bryde39。s, minke and blue whales. The big family migrate between winter tropical breeding areas (North West Shelf, Great Barrier Reef, New Caledonia, Vanuatu, Fiii, Tonga) and summer Antarctic feeding areas. Once mon in New Zealand waters, humpbacks are now rarely seen and may migrate further offshore. Males pete for mates either by physical fight or by song. Females give birth to their young every two to three years。 some nonbreeding females probably remain in the southern waters during winter. Young humpback whales return to their area of birth but in later life some wander between breeding areas. Humpbacks eat small shrimps and other schooling prey, such as fish, forming small, cooperative groups of two to three individuals to feed. Similar species: Easily identifiable due to a 39。hump39。 back when submerging, but at a distance may be confused with other species that raise their flukes when diving, such as sperm, right and blue whales. Protection status: Recovering well from past whaling and now numerous in some former migration and aggregation areas, rarely seen in others.（1）Which of the following is TRUE about humpback whales? A.Their long flippers vary in length, size and shape like dorsal fin.B.They are large and likely to grow longer than 15 metres.C.The different colors and patterns of the body help to be recognized.D.Their bumpy tubercles and blowholes are on both sid