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

1、section& section.完形填空for years scientists have been worried about the effects of air pollution on the earths 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 suff

2、er 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

3、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 disco

4、vered a natural pollution control system _13_building green plants.scientists dont really know _14_control air pollution.they believe that a plants 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 building

5、s 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

6、 and more _20_ place.1a.airblightchealth datmosphere2a.lighter bworsecthicker dheavier3a.permit bdesireccause dpersuade4a.pollution bgasescdifficulties dproblems5a.at least bhardlyconly deven6a.actual bloosecindoor ddowntown7a.fear battentioncremark dstore8a.houses bpreparationscfurniture defforts9a

7、.using bresistingcvaluing djudging10a.materials btablescindustries ddrinks11a.if balthoughcas dunless12a.chance binstructioncscientist dway13a.from bforcwith dlike14a.water bplantscproducts dmeasures15a.take in bput offclet out dgive out 16a.time bexchangecorder dparticular17a.suggest brequirecbeg d

8、order18a.colors bstudiescroots dcontainers19a.share breducecclean dincrease20a.boring badvancedccrowded dhealthy.阅读理解acan dogs see colors?mans best friend is colorblind, but, fortunately, his survival does not depend upon the ability to see colors.his keen sense of smell compensates_for his inabilit

9、y 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 sign

10、al for food, and other colors that were not for food. similar tests that was conducted on cats produced similar results, which led scientists to conclude that they, too, are colorblind and live in a gray world.the inability of most animals to see colors, from an evolutionary (进化的) standpoint, is qui

11、te 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

12、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! 1according to_

13、，scientists found that dogs and cats are colorblind.awhat food they intend to eatbtheir keen sense of smellcan evolutionary standpointdtheir responses to colors for food2the underlined phrase “compensate for” probably means_.abe different from bmake up forcrely on dgive in to3except for_all the foll

14、owing animals can tell apart different colors.alions bhumanscmonkeys dapes4which of the following is not true about dogs?athey have dullcolored coats.bthey hunt for food in the dark of night.cthey can survive without any threat.dtheir other senses, especially their sense of smell，are very sensitive.

15、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 i

16、n 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 a

17、ll 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

18、 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.5according to the passage，the famous everglades lies _.ama

19、inly in georgiabin the north of floridacto the south of the okefenokeednear the national wildlife refuge6the underlined word “it” in paragraph 2 refers to “_”aflorida bthe okefenokeecgeorgia dan ocean7the third paragraph mainly tells us _.awhere the okefenokee liesbwhat the size of the okefenokee is

20、 chow the floating islands come into beingdhow the okefenokee gets its special name8what can be inferred from the passage?athe okefenokees alligators attract many tourists.bhammocks tremble but do not move.cfires prevent the okefenokee from drying up.dflorida and georgia cover 1,800 square kilometer

21、s in total.详解答案.语篇解读：空气污染对生态环境的破坏非常严重。针对这种情况，科学家找到了一些解决该问题的方法。1选a由下文的the air outside可知答案。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。3选c句意为：室内空气污染能使人感到疲惫、眼睛疼痛、头痛以及其他问题。4选d疲劳、眼睛疼痛、头痛都是室内污染带来的问题，所以本空选择problems。5选d“导致癌症”与“导致呼吸紊乱、血液病”在程度上有递进的关系，故用even。6选c第二段讲的是室内污染所带来的一些问题，以及所导致的一些疾病，因此此处指多数科学家断言每一个现代居室都存在着室内污

22、染。7选b本句话表示“人们开始关注这个问题”。pay attention to“注意，重视”，固定搭配。8选a由下一句“to do this they built buildings that limited the flow of air between inside and outside”可知，所填词与建筑有关，所以用houses。9选a上文提到，他们在建造房屋与办公室时不想浪费能源，所以此处指他们也开始使用人造材料，所以填using。10选a由空前的manmade building materials可知，这里表示这些材料释放有害气体。11选c下半句scientists began searching for a _12_ to deal with it是上半句的结果，上半句意为：因为这个问题越来越严重。12选d解决污染问题，只能是寻找一种方法， 故用way。13选b本句话意思是：他们发现了一种适用于建筑的天然材料。for在此表示“适用于”。14选b由下一句“they believe that a plants leaves absorb or _15_ pollutants”可知，此处选plan