新概念英语2第17课:新概念英语4第17课习题及答案

新概念英语第4册课后习题答案: 　　Unit 17 BBADA BBDCD CA 　　新概念英语第4册课后习题: 　　Multiple choice questions 多项选择题 　　Choose the correct answers to the following questions. 　　Comprehension 理解 　　1 One of the reasons rabbits multiplied so rapidly in Australia is that they ______. 　　a.were unwisely introduced by enterprising settlers 　　b.breed rapidly 　　c.overran the continent 　　d.overcame their natural enemies in the Antipodes 　　2 Scientists found ______ of spreading myxomatosis. 　　a.one way 　　b.two ways 　　c.three ways 　　d.a large number of ways 　　3 The disease was spread right across the continent of Australia largely because ______. 　　a.of the mosquito 　　b.of the rabbit 　　c.scientists let infected animals loose in burrows 　　d.Australia encouraged diseased rabbits to migrate to other places 　　4 Myxomatosis, that was a blessing in Australia, proved to be ______in Europe. 　　a.domesticated 　　b.a disease 　　c.profitable 　　d.a curse 　　Structure 句型 　　5 This rabbit had no natural enemies in theAntipodes ______.(1.2) 　　a.and as a result it multiplied 　　b.in order to multiply 　　c.so that it might multiply 　　d.because it multiplied 　　6 It______ and caused devastation.(1.3) 　　a.burrowing 　　b.burrowed 　　c.was burrowing 　　d.has burrowed 　　7 ______ were local epidemics created? By infecting animals.(1.6) 　　a.Why 　　b.How 　　c.Where 　　d.When 　　8 It was ______ to create local epidemics of this disease.(11.6-7) 　　a.potent 　　b.able 　　c.enabled 　　d.possible 　　Vocabulary 词汇 　　9 It caused devastation by ______ the herbage.(11.3-4) 　　a.burrowing into 　　b.infecting 　　c.consuming 　　d.digging 　　10 By infecting animals and ______them loose in burrows ...(1.6) 　　a.allowing 　　b.leaving 　　c.introducing 　　d.turning 　　11 The rabbits were able to ______this disease to a certain extent.(1.10) 　　a.react to 　　b.prevent 　　c.withstand 　　d.oppose 　　12 Australia ______the rabbit as a pest from Europe.(1.13) 　　a.inherited 　　b.obtained 　　c.assumed 　　d.claimed

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