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18.Hermit crabs (寄居蟹) live their lives in temporary,second-hand accommodation.As the hermit crab grows,it must find a larger shell for (61)protection(protect).If a shell is too small,the crab will not be able to move back fully into it and therefore becomes (62)aneasy target of its enemies.
Competition(63)forempty shells can be quite fierce among hermit crabs,especially if the supply is limited.Sometimes,however,the crabs form orderly"chains",waiting patiently for some (64)hours(hour)to obtain a shell of the right size.
This process begins with a single hermit crab leaving its own shell(65)to inspect(inspect) a nearby empty shell for size.If the shell is too large,the crab will return to (66)its(it) own shell and wait close to the empty shell.As new crabs arrive,they repeat the inspection process.
If the new home (67)proves(prove) unsuitable,they will return to their shells to wait in a queue.
(68)Amazingly(amaze),the crabs order themselves in this waiting chain,(69)whichmay consist of up to 20 individuals,from the largest to the smallest!When a crab claims the empty shell,all the individuals in the queue quickly exchange their shells in order,each crab (70)moving(move) up to the next-sized shell!.

分析 本文主要介绍寄居蟹的生活方式,即:常寄居于死亡软体动物的壳中.

解答 61.protection 考查名词.for是介词,后接名词作其宾语,动词protect的名词是protection.
62.an 考查冠词.target是可数名词,其前加不定冠词a表示泛指,因easy的读音是以发元音开头的,用不定冠词an.
63.for 考查介词.for意为"对于,在…方面".
64.hours 考查名词.hour是可数名词,其前有some修饰时要用复数形式.
65.to inspect 考查动词不定式.此处动词不定式表示目的.
66.its 考查代词.shell是名词,其前要用形容词性物主代词作定语.
67.proves 考查动词时态.在条件状语从句中,主句用一般将来时态,从句用一般现在时态,因主语home是单数三人称,谓语动词也应用单数三人称形式.
68.Amazingly 考查副词.修饰句子要用副词,动词amaze的副词是amazingly.
69.which 考查定语从句.分析句子结构可知这是一个定语从句,先行词是chain,在从句中作主语,用关系代词which.
70.moving 考查现在分词.each crab与move之间是主谓关系,用现在分词构成独立主格结构.

点评 在一篇200词左右的语篇(短文或对话)中留出10处空白,部分空白的后面给出单词的基本形式,要求考生根据上下文填写空白处所需的内容或所提供单词的正确形式,所填写词语不得多于3个单词.要做好语法填空题,理解短文是解题的前提,扎实的词汇、句型和语法知识是基础,英语国家的背景知识是必要的补充.考生须灵活运用语法知识,如单词词性、单词时态、名词单复数、连接词、代词、冠词等判断各空白处应填写的内容.答完后,还要通读全文,核对所填单词形式是否正确,是否符合语境.

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