高中英语《Unit 2 Heroes》Section Ⅱ SectionⅢ课下作业 北师大版必修1

SectionⅡ& SectionⅢⅠ.完形填空For years scientists have been worried about the effects of air pollution on the earth's natural conditions.Some believe the __1__inside many houses may be more dangerous than the air outside.It may be one hundred times__2__.Indoor air pollution can __3__ a person to feel tired，to suffer eye pain，headache and other __4__.Some pollutants can cause breathing disorders，diseases of blood and __5__ cancer.Most scientists agree that every modern house has some kind of __6__ pollution.People pay more __7__to the problem now.It is that when builders began making __8__and offices they did not want to waste energy.To do this they built buildings that limited the flow of air between inside and outside.They also began __9__ man­made building materials.These __10__ are now known to let out harmful gases.__11__the problem became more serious，scientists began searching for a __12__to deal with it.They discovered a natural pollution control system __13__building green plants.Scientists don't really know __14__control air pollution.They believe that a plant's leaves absorb or __15__ pollutants.In __16__the plant let out oxygen through its leaves and tiny organization on its roots.Scientists __17__ that all buildings should have one large plant or several small plants inside every nine square meters of space.__18__of different plants show that each absorbs different chemicals.So the most effective way to __19__ the air is to use different kinds of plants.Having green plants inside your house can make it a prettier and more __20__ place.1． A.air B．lightC．health D．atmosphere2． A.lighter B．worseC．thicker D．heavier3． A.permit B．desireC．cause D．persuade4． A.pollution B．gasesC．difficulties D．problems5． A.at least B．hardlyC．only D．even6． A.actual B．looseC．indoor D．downtown7． A.fear B．attentionC．remark D．store8． A.houses B．preparationsC．furniture D．efforts9． ing B．resistingC．valuing D．judging10．A.materials B．tablesC．industries D．drinks11． A.If B．AlthoughC．As D．Unless12．A.chance B．instructionC．scientist D．way13．A.from B．forC．with D．like14．A.water B．plantsC．products D．measures15．A.take in B．put offC．let out D．give out16．A.time B．exchangeC．order D．particular17．A.suggest B．requireC．beg D．order18．A.Colors B．StudiesC．Roots D．Containers19．A.share B．reduceC．clean D．increase20．A.boring B．advancedC．crowded D．healthyⅡ.阅读理解ACan dogs see colors?Man's best friend is colorblind, but, fortunately, his survival does not dependupon the ability to see colors.His keen sense of smell compensates_for his inability to see colors, and enables him to differentiate between things.Extensive scientific testing on dogs supports the conclusion that they live in a colorless world. The testing done primarily focused on the dogs' responses to colors for food. Dogs could not tell the difference between one color, a signal for food, and other colors that were not for food. Similar tests that wasconducted on cats produced similar results, which ledscientists to conclude that they, too, are colorblind andlive in a gray world.The inability of most animals to see colors, from anevolutionary (进化的) standpoint, is quite simple to understand. Many colorblind animals have dull­colored coats, hunt for food in the dark of night, or graze in the dim twilight (黄昏的) hours. Their other senses have developed to the point where the lack of color vision in no way weakens them. For them, life in a colorless world is neither a handicap, nor a threat to their survival.The only animals, other than man, which scientists can conclusively say have color vision are monkeys and apes. Both can be trained to open a colored door, behind which is food, and man can be trained to open a refrigerator door of any color!1．According to________，scientists found that dogs and cats are colorblind.A．what food they intend to eatB．their keen sense of smellC．an evolutionary standpointD．their responses to colors for food2．The underlined phrase “compensate for” probably means________.A．be different from B．make up forC．rely on D．give in to3．Except for________all the following animals can tell apart different colors.A．lions B．humansC．monkeys D．apes4．Which of the following is NOT true about dogs?A．They h ave dull­colored coats.B．They hunt for food in the dark of night.C．They can survive without any threat.D．Their other senses, especially their sense of smell，are very sensitive.BThe state of Florida is best known for its beaches and palm trees.But a large part of it is swamp(沼泽地)．The famous Everglades，a slow­moving sheet of water full of plants and alligators(鳄鱼)，covers much of the southern part of the state.To the north，the Okefenokee，which is partly in Florida and mostly in neighboring Georgia，is a true swamp with its own alligators and snakes.It was formed when waters from an ancient ocean drew back and a large sandbar(沙洲)blocked most of the water flow to the sea.There is no big city within 200 kilometers，but tourists from all over the world manage to find it.They all want to know about its unusual name.Okefenokee is a Miccosukee Indian word meaning land of trembling(颤抖的)earth.Way back in the swamp are small，floating(漂浮的) islands，which one can walk across.And they tremble.Standing on them is like trying to balance on a floating mattress(床垫)．The Okefenokee，which is already nearly filled with plants，would probably dry up and become just another forest if it were not for the fires that come along from time to time.So the water in this protected National Wildlife Refuge keeps moving —slowly，very slowly.5．According to the passage，the famous Everglades lies ________.A．mainly in GeorgiaB．in the north of FloridaC．to the south of the OkefenokeeD．near the National Wildlife Refuge6．The underlined word “It” in Paragraph 2 refers to “________”．A．Florida B．the OkefenokeeC．Georgia D．an ocean7．The third paragraph mainly tells us ________.A．where the Okefenokee liesB．what the size of the Okefenokee isC．how the floating islands come into beingD．how the Okefenokee gets its special name8．What can be inferred from the passage?A．The Okefenokee's alligators attract many tourists.B．Hammocks tremble but do not move.C．Fires prevent the Okefenokee from drying up.D．Florida and Georgia cover 1,800 square kilometers in total.详解答案Ⅰ.2．选B 上句话说室内空气比室外空气坏，本句说的是室内空气比室外空气差的倍数。