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 本文主要介紹寄居蟹的生活方式,即:常寄居于死亡軟體動物的殼中.

解答 61.protection 考查名詞.for是介詞,后接名詞作其賓語,動詞protect的名詞是protection.
62.a(chǎn)n 考查冠詞.target是可數(shù)名詞,其前加不定冠詞a表示泛指,因easy的讀音是以發(fā)元音開頭的,用不定冠詞an.
63.for 考查介詞.for意為"對于,在…方面".
64.hours 考查名詞.hour是可數(shù)名詞,其前有some修飾時要用復數(shù)形式.
65.to inspect 考查動詞不定式.此處動詞不定式表示目的.
66.its 考查代詞.shell是名詞,其前要用形容詞性物主代詞作定語.
67.proves 考查動詞時態(tài).在條件狀語從句中,主句用一般將來時態(tài),從句用一般現(xiàn)在時態(tài),因主語home是單數(shù)三人稱,謂語動詞也應用單數(shù)三人稱形式.
68.Amazingly 考查副詞.修飾句子要用副詞,動詞amaze的副詞是amazingly.
69.which 考查定語從句.分析句子結構可知這是一個定語從句,先行詞是chain,在從句中作主語,用關系代詞which.
70.moving 考查現(xiàn)在分詞.each crab與move之間是主謂關系,用現(xiàn)在分詞構成獨立主格結構.

點評 在一篇200詞左右的語篇(短文或對話)中留出10處空白,部分空白的后面給出單詞的基本形式,要求考生根據(jù)上下文填寫空白處所需的內容或所提供單詞的正確形式,所填寫詞語不得多于3個單詞.要做好語法填空題,理解短文是解題的前提,扎實的詞匯、句型和語法知識是基礎,英語國家的背景知識是必要的補充.考生須靈活運用語法知識,如單詞詞性、單詞時態(tài)、名詞單復數(shù)、連接詞、代詞、冠詞等判斷各空白處應填寫的內容.答完后,還要通讀全文,核對所填單詞形式是否正確,是否符合語境.

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