【正文】 Plant breeding is the science of changing the characteristics of plants in order to produce desired ones. Genes in a plant are what determine what type of characteristics it will have. Plant breeders try to create a specific oute of plants and potentially new plant varieties by changing the genes of the plants through breeding, which is making new plants from parents of different varieties or species. 【點評】本題考點涉及細節(jié)理解和主旨大意兩個題型的考查，是一篇科研類閱讀，考生需要準確捕捉細節(jié)信息，并根據上下文的邏輯關系，進行概括和歸納，從而選出正確答案。為什么這些人非常吸引蚊子呢？可知，本文探討的話題是：為什么一些人比其他人更容易招蚊子。根據第二段中的“According to Smithsonian Magazine, around 20 percent of people in the world are especially tasty to mosquitoes. What about these people makes mosquitoes39。故選B。根據最后一段中的“Scientists remend that we use insect repellent and wear lightcolored clothing.”科學家建議我們使用驅蟲劑或者穿淺顏色的衣服。故選B。根據第七段“This love for CO2 can also put pregnant women at increased risk for mosquito bites, as they tend to exhale 21 percent more CO2 than people of the same age and size who aren39。故選C。根據第四段中的“While flying along, they use their sense of smell to find possible targets. They find victims by smelling the carbon dioxide (CO2) breathed out by humans and animals. ”飛的時候，它們用嗅覺發(fā)現目標。s the article mainly about? new finding about mosquitoes. people can avoid mosquito bites. popular myth about mosquitoes. some people are more attractive to mosquitoes than others.【答案】 （1）C（2）B（3）B（4）D 【解析】【分析】本文是一篇說明文，介紹了為什么有些人可以整個夏天坐在戶外乘涼卻不被蚊子叮咬，而有些人一出門就好像要被蚊子吃掉一樣。Being bitten by mosquitoes is annoying, but don39。 In addition to carbon dioxide, the color of the clothes you wear also plays a role in attracting mosquitoes.This love for CO2 can also put pregnant women at increased risk for mosquito bites, as they tend to exhale 21 percent more CO2 than people of the same age and size who aren39。As a result, people who simply exhale (呼出) more of the gas over time – generally, larger people – have been shown to attract more mosquitoes than others. This is why kids don39。 s why you monly find them in crowded streets and parks. s not plicated. The two most important reasons a mosquito is attracted to you have to do with sight and smell.A popular myth claims that mosquitoes prefer certain blood types, but the fact is that they simply can39。re not alone. According to Smithsonian Magazine, around 20 percent of people in the world are especially tasty to mosquitoes. What about these people makes mosquitoes39。 re being eaten alive within minutes of stepping outdoors. 7．閱讀理解 縱觀全文可知，,作者提到無現金支付即電子支付的好處,也提到電子支付引起的擔憂,對待電子支付是客觀的,故選C。故選B。大多數金融公司都渴望放棄它,或者以高昂的費用勸阻老式客戶。根據第四段中的 “But equally important is that suppliers such as banks and tech firms (in developed markets)... Most financial firms are keen to abandon it, or discourage oldfashioned customers with heavy fees.”可知現金消失的一個重要原因就是諸如銀行和科技公司（在發(fā)達市場）和電信公司（在新興市場）之類的供應商正在開發(fā)快速,易于使用的支付技術,他們可以從中提取數據和小費。故選C。根據第三段中的“In Sweden the number of retail cash transaction per person has fallen by 80% in the past ten years.”可知在過去的十年中,瑞典的人均零售現金交易數量下降了80％；再根據“In China digital payments rose from 4% of all payments in 2012 to 34% in 2017.”可知在中國,數字支付從2012年占所有支付的4％上升到2017年的34％。故選D。根據第一段中的“Rich countries are racing to dematerialise payments.”可知, 富裕國家正競相將支付非物質化；再根據第三段中的“In Sweden the number of retail cash transaction per person has fallen by 80% in the past ten years.”在過去的十年中,瑞典的人均零售現金交易數量下降了80％?？偟膩碚f,無現金經濟的未來是個好消息,但是對于電子支付人們也有一些擔憂。D.C.B.. A.s attitude towards digitalized payment is the infrastructure is developing at a high speed in developed marketsD.younger consumers are short of money to live their digital livesB.China is developing faster that those developed countries in digital payment（3）Cash is disappearing largely because that cash is still king across the worldC.. A.promote payment without paper money or coins（2）In paragraph 3, several countries are mentioned to show get rid of the sideeffects of cashC.. A. Yet set against these benefits are a couple of worries. Electronic payment systems may risk technical failures, power failure and cyberattacks. In a cashless economy the poor, the elderly and country folk may be left behind. And a digital system could let governments watch over people39。 Cash is dying out because of two forces. One is demand— younger consumers want payment systems that plug easily into their digital lives. But equally important is that suppliers such as banks and tech firms (in developed markets) and teles panies (in emerging ones) are developing fast, easytouse payment technologies from which they can pull data and pocket fees. There is a high cost to running the infrastructure behind the cash economy—ATMs, vans carrying notes, tellers who accept coins. Most financial firms are keen to abandon it, or discourage oldfashioned customers with heavy fees. For the past 3,000 years, when people thought of money they thought of cash. Over the past decade, however, digital payments have taken off— tapping your plastic on a terminal or swiping a smartphone has bee normal. Now this revolution is about to turn cash into an endangered species in some rich economies. That will make the economy more efficient—but it also causes new problems that could hold back the transition(轉型).6．閱讀理解 故選A。 （4）考查主旨大意。根據最后一段“Loop is set to launch later this year in three eastern . states, and also in Paris, France and some of the surrounding area. Then Loop plans to expand to the . West Coast, Toronto, Canada and Britain by the end of this year or 2020.”可知，Loop計劃在2020年前將業(yè)務擴大到加拿大和法國。故選C。 （2）考查細節(jié)理解。s cities produce 2 billion tons of trash every year. By the year 2050 that number is expected to rise to 3 billion tons. The World Bank estimates that the largest amount of trash today, about 44 percent, is plastic. But we often have to buy packaged goods. And