【正文】 hey invade the cells of living organisms to reproduce, spread and take over.Viruses can infect every living thing – from plants and animals down to the smallest bacteria. ____17____ Sometimes a virus can cause a disease so serious that it is fatal. Other viral infections bring about no noticeable reaction.Viruses lie around our environment all of the time, waiting for a host cell to e along. They can enter our bodies by the nose, mouth, eyes or breaks in the skin. ____18____ For example, HIV, which causes AIDS, attacks the Tcells of the immune system.But the basic question is, where did viruses first e from? ____19____ “Tracing the origins of viruses is difficult,” Ed Rybicki, a virologist at the University of Cape Town in South Africa, told Scientific American, “because viruses don’t leave fossils (化石) and because of the tricks they use to make copies of themselves within the cells they’ve invaded.”However, there are three main theories to explain the origin of viruses. First, viruses started as independent organisms, then became parasites (寄生者). Second, viruses evolved from pieces of DNA or RNA that “escaped” from larger organisms. Third, viruses coevolved with their host cells, which means they existed alongside these cells.___20___ The technology and evidence we have today cannot be used to test these theories and identify the most plausible explanation. Continuing studies may provide us with clearer answers.A. But what are viruses?B. For the time being, these are only theories.C. Once inside, they try to find a host cell to infect.D. The answer may be even less satisfactory than it now appears.E. Until now, no clear explanation for their origin exists.F. Experts are concerned about the bad effect that it had on people’s health.G. For this reason, they always have the potential to be dangerous to human life.【答案】16. A 17. G 18. C 19. E 20. B【解析】這是一篇說明文。故選A項。s the natural side of thingsso rainfall data, soil moisture and many other natural factors, explains Schme. This enables it to identify areas where availability of water is likely to bee a concern.“Then we also look at vulnerability in terms of socioeconomic and political developmentsanything from a regime type to the state of development in a region, she adds.This additional information is weighed up to determine whether it increases or decreases the chance of conflict. Other factors might include whether the water insecurity is likely to affect crops.The tool is just one part of a wider WPS project that aims to increase the availability of information which could help avoid waterrelated conflicts. Once artificial intelligence has made its predictions the WPS researchers use other analytical tools to zoomin on a certain region and find out exactly what39。t just him, the researchers asked 24 people to view images of the “ Mona Lisa on a puter screen ”（為了確認不只是他有這樣的感覺，他邀請了24個人去看電腦屏幕上的蒙娜麗莎圖像），可知，他用24個人去做實驗，只是為了驗證自己的想法。s most famous painting seems to look back at observers, following them with her eyes no matter where they stand in the room.”（人們通常認為，達芬奇名畫蒙娜麗莎似乎在回視著觀察者，無論他們站在屋里的什么地方），可知，蒙娜麗莎給人的感覺是，人們在注視她的同時，她也在看著人們。t looking at him. To make sure it wasn39。故劃線句子“I cry just thinking about it”是說羅賓?巴洛為詹姆斯的獻血而感動。故選D。由此可推斷出哈里森退休后對Rh項目還有影響。哈里森停止獻血了?！?題詳解】詞句猜測題。他的獻血也促進了未來的澳大利亞抗D計劃?！澳Хㄖ亍杯h(huán)繞著護城河布雷，這是蘇格蘭西南部鄧弗里斯的一座喬治王朝時期的聯(lián)排別墅，是彼得故選C項。 25 child。AWindermere JettyThis new museum will trace 200 years of boats and boatbuilding in the Lakes. The vessels on show will range from historic steam launches to recordbreaking speed boats. The conservation workshop will also allow visitors to watch the restoration work take place. Venture out on to the water on cruise boats and grab the opportunity to sail on the Osprey, a restored Edwardian steam boat..Opens 23 March, adult 163。6. What is the probable relationship between the two speakers?A. Classmates B. Brother and sister C. Mother and son7. Why was Cathy upset?A. She failed to get a prize.B. She received her mom39。每段對話僅讀一遍。聽完每段對話后你都有10秒鐘的時間來回答有關小題和閱讀下一小題。聽第6段材料,回答第6,7題。,閱讀下列短文,從每題所給的A、B、C、D四個選項中選出最佳選項。 35 adult, 163。）可知，在Windermere Jetty里，人們可以乘坐蒸汽船游行。s Literature一段中“Neverland is real after enchanted land, surrounding Moat Brae, a Georgian townhouse in Dumfries, southwest Scotland, was the inspiration behind the tale of Peter Pan. ”（夢幻島畢竟是真實存在的。60年里他獻血近1200次，他自然產生RH陰性血，其中含有RH陽性抗體，拯救了數(shù)百萬嬰兒。故選B。根據(jù)倒數(shù)第二段“They had already extended the age limit for blood donations for him, and they’re cutting him off now to protect his health.”可知，的醫(yī)生說應該讓詹姆斯由此可推斷出詹姆斯?哈里森退出這個項目，但卻促進了科學家收集和編目他的DNA，將要建立一個抗D和白細胞庫。分析選項A. ；B. Diligent. 勤奮的； C. Talented. 天才的；D. 。他救了數(shù)百萬嬰兒”。s gaze is no more than about 5 degrees off to either side, the Mona Lisa effect occurs.Horstmann and his coauthor were studying this effect for its application in the creation of artificialintelligence avatars (虛擬頭像) when Horstmann took a long look at the ”Mona Lisa and realized she wasn39。s mon knowledge that the woman in Leonardo da Vinci39。根據(jù)文章第三段，“To make sure it wasn39。t simply a case of conflicts increasing every time a water security incident occurs. Several regional and cultural factors also play a part, making prediction difficult.The researchers test ran the AI tool in Mali. They found that it predicted more than threequarters of the waterrelated conflicts there. To achieve this, the system is fed with a variety of data. First there39。故選B項。”）可知，其氣候與馬里與水相關的沖突有關。選項中有兩項為多余選項。故G選項“因此，它們總是有可能對人類的生命構成威脅”符合上下文語境，故選G。故E選項“到目前為止，對它們的起源還沒有明確的解釋”符合上下文語境，故選E?！?1題詳解】考查動詞詞義辨析。故選B項。句意：他向我解釋了不同的電話計劃，他說比我現(xiàn)在的更好。由此可知，我沒有在認真聽，但（可能出于禮貌）我依然以 “嗯嗯”回應，作為對對方的回應和認可，當然也是向他證明我在（聽）?！?7題詳解】考查形容詞詞義辨析。句意：但我一直保持冷靜和禮貌，直到通話結束?！盇. revealed 透露，揭露；B. remended 推薦；C. promised 承諾；D. introduced 介紹。今天，從上午10點開始，我沒有哪一句話受到侮辱?！?2題詳解】考查名詞詞義辨析。故選B項。句意：我意識到，在他工作的日子里，他可能一直是言語暴力的對象。 the appropriate use of ___39___ (mask) and personal protective equipment, ___40___ (especial) in a healthcare setting?！?7題詳