2019_2020学年高中英语Unit4Exploringplants课后限时作业7新人教版选修9.docx

课后限时作业(七)限时/50分钟.单句语法填空1New technologies have made it possible to turn out new products faster and at a lower cost. 解析 分析句子结构可知，此处为“makeitadj.to do”结构，其中it作形式宾语，动词不定式to turn outcost为真正的宾语。句意：新兴科技已经使得以更快的速度且更低的成本生产新产品成为可能。2In the community meeting, they are making every endeavour to widen (wide) the discussion to include the environmental issues.解析 endeavour to do sth努力做某事。句意：在社区会议中，他们正在尽量拓宽讨论范围以纳入环境问题。3Recently, a study shows that smoking increases the risk of heart attack, and regularly drinking alcohol may lower (low) it.解析 句意：最近，一项研究表明吸烟会增加患心脏病的风险，而规律性饮酒也许会降低这种风险。4The victims families of the murder have appealed to the Supreme Court to have a definitive answer. 解析 appeal to向申诉。句意：谋杀案的被害者家属已经请求最高法院给出确切的答复。5This charming cottage dates back to the 15th century and is as pretty as a picture, with its thatched(茅草盖的) roof and beautiful garden.解析 句意：这所美丽的村舍可追溯到15世纪，有茅草房顶和美丽的花园，漂亮极了，简直和画上的一样。6The male of the species is typically (typical) smaller than the female.解析 此处要用副词作状语修饰形容词比较级。句意：这个物种的雄性通常比雌性小。7Roses may not be rare or new to you, but they sure are among the most beautiful flowers in the world and this is exactly why we all love them.解析 句意：或许玫瑰对你来说并不罕见或新鲜，但它们绝对是世上最美的花之一，这也恰恰是为什么我们都喜爱它的原因。8It is difficult for us to learn a lesson in life until we have had (have) that lesson actually. 解析 用现在完成时代替将来完成时表动作在将来某时前完成。句意：学习某个教训是困难的，直到我们已经确实经历了这个教训。9 Giving (give) out awful noise, the machine works day and night outside. I can hardly put up with it.解析 现在分词作伴随状语。句意：外面的机器日夜不停地工作，发出讨厌的噪音，我几乎无法忍受这些声音。10A scared child needs the comfort and security of a loving hand, or a hug, or a lap to sit on .解析 不定式短语修饰lap，意为“可以坐的大腿”，不定式后面的介词不能省略。句意：惊慌的小孩需要一只慈爱的手、一个拥抱、一个可坐的大腿，来获得安慰和安全感。.阅读理解AJust when scientists think they have discovered and recorded every species of insect that crawls on the earth they find something new.Earlier this month, Peter Jager, the head of Frankfurts Senckenberg Research Institute reported the discovery of a unique eyeless spider!The creature that has a leg span(跨度) of six centimeters and a body size of just twelve millimeters was found in a cave inside the tiny nation of Laos, in Southeast Asia. It was identified as a member of the Huntsman spider, a large family that consists of 1,100 species.However, the other members of the family all have eyes.The spider is the first one that has no eyes.The scientists believe that the reason for the lack of eyes can be that these spiders spend their entire life inside caves.In the past they have seen other members of the Huntsman spiders living in caves with six or less eyes.They believe that the kind of spider has adapted to the fact that they do not really need the eyes to such an extreme measure that they have dispensed with them altogether.But they are not the only creature to have done that.Over the years, scientists have discovered completely blind cave fish, and even a freshwater crab, which happens to live in the same cave as this eyeless spider!Surrounded by Burma and China on the northwest, Vietnam on the east, Cambodia on the South and Thailand on the west, the landlocked nation of Laos has been a treasure trove (宝藏) of an incredible number of new and exotic species.In the last few years researchers have discovered the Saolaneverbeforeseen antelopelike creature, a small deer species called muntjacs, a tiny striped rabbit and a rock rat that was thought to have been extinct 11 million years ago.In addition to that it is also home to over one hundred species of large mammals ranging from tigers to macaques and over 165 species of amphibians and reptiles like the terrible King cobra and the noisy Tokay gecko, a permanent resident inside most Laos households.语篇导读本文为说明文，介绍了科学家们在老挝发现的一种新物种盲蛛。1What can we know about the newly discovered species of spider?AThey are smaller in size.BThey only live in Laos.CThey belong to the Huntsman spider.DAbout 1,100 such spiders were discovered.解析 C细节理解题。根据第二段第二句可知，这种新发现的蜘蛛属于巨蟹蛛科，故选C项。2What does the underlined part “dispensed with” in Paragraph 2 mean?AGot rid of.BPut up with.CGot tired of.DTaken no notice of.解析 A词义猜测题。根据上文盲蛛已经适应了生活在黑暗的洞穴里，不需要眼睛可知，画线部分与get rid of(去除)意思相近，故选A项。3What can we know from the passage?ATokay gecko is common in Laos.BPeter Jager was the first spider discoverer.CBlind fish and crabs were also found in Laos.DWest of Laos lie two neighboring countries.解析 A细节理解题。根据最后一段最后一句可知，Tokay gecko在老挝很常见，故选A项。BIf you travel to a new exhibit at the San Francisco Conservatory of Flowers, you will have chances to see some meateating plants. Take bladderworts, a kind of such plant, for example. They appear so small and grow in a quiet pond. But these are the fastestknown killers of the plant kingdom, able to capture a small insect in 1/50 of a second using a trap door!Once the trap door closes on the victim, the enzymes(酶) similar to those in the human stomach slowly digest the insect. When dinner is over, the plant opens the trap door and is ready to trap again.Meateating plants grow mostly in wet areas with soil that doesnt offer much food value. In such conditions, these amazing plants have developed insect traps to get their nutritional needs over thousands of years. North America has more such plants than any other continents.Generally speaking, the traps may have attractive appearance to fool the eye, like pitcher plants, which get their name because they look like beautiful pitchers (a container like a bottle) full of nectar(花蜜)The Asian pitcher plant, for example, has bright colors and an attractive halfclosed lid. Curious insects are tempted to come close and take a sip, and then slide down the slippery(光滑的) slope to their deaths.Hairlike growths along the pitcher walls ensure that nothing can escape, and the digestive enzymes can get to work. A tiny insect can be digested in a few hours, but a fly takes a couple of days.Some of these pitchers are large enough to hold two gallons. Meateating plants only eat people in science fiction movies, but sometimes a bird or other small animals will discover that a pitcher plant isnt a good place to get a drink.语篇导读本文为说明文，介绍了一些特别的植物靠捕食动物获得生长所需养分的“食肉植物”。4What can we know about bladderworts from Paragraph 1?AThey can capture 50 small insects in a second.BThey can capture an insect in the shortest time.CThey can be found floating on a quiet lake.DThey can digest an insect in 1/50 of a second.解析 B细节理解题。根据第一段最后一句可知，bladderworts能在1/50秒的时间内捕获一只小昆虫，是植物中已知的捕获动物速度最快的，故选B项。5If the trap door of a meateating plant is closed, the plant .Ais fooling insects into taking a sipBis producing nectarCis tempting insects to come closeDis enjoying a dinner解析 D细节理解题。根据第二段可知，一旦“陷阱门”将猎物关起来，类似于人胃里的那些消化酶就开始慢慢地消化了，故选D项。6Why can meateating plants grow in wet and poor soil?ABecause they can get nutrition from animals.BBecause they dont need much food value.CBecause they can make the most of such conditions.DBecause they have developed digestive enzymes.解析 A推理判断题。根据第三段可推出，这种植物之所以能够生长在这些地方是因为它们主要从动物中获取养分，而不是从土壤中获取养分，故选A项。7What can we know from the passage?ASouth Asia has the most meateating plants.BSome of the meateating plants can even eat a human.CHairlike growths in the plants help trap insects.DThe traps of these plants have a dull color.解析 C推理判断题。根据倒数第二段可知，这些须状的东西可以防止小昆虫逃跑，故选C项。.七选五On holidays youre likely to eat and overeat between family gatherings, office parties and celebrating with friends. 1 Here are some tips to help you enjoy holiday food without completely changing your diet：Switch to small plates.Not only do smaller dishes fill up faster, but the same size helping looks like more food when its on a small dish. 2 But whatever the size of your plate, its most important to remember to keep it balanced; half for vegetables, a quarter for grains and a quarter for lean meat.Measure out snacks.Your favorite holiday movie is on. Take a minute to check the nutrition label and measure out a serving to keep calories in check. Take one popular brand of buttered microwave popcorn for example. 3 But the bag contains 2.5 servings. Eat the whole thing on your own, and youll have eaten 425 calories.Split an entree(主菜)Many restaurants serve far more food than one person needs in a single meal. 4 Or pack half your entree to go as soon as its served. Or choose a smallsize option,