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Most birds find it safe to sleep in the trees, but ________ they have eggs or young chicks, they don’t use a nest.


  1. A.
    why
  2. B.
    how
  3. C.
    unless
  4. D.
    where
C
本題考查連詞的用法。unless表“除非”,除非它們下蛋或撫育雛鳥,它們不去使用巢穴。
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Most birds find it safe to sleep in the trees,but_______they have eggs or young chicks,they don’t use a nest.

A.why                                                             B.how

C.unless                                                          D.where

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完形填空(共20小題;每小題1分,滿分20分)
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【小題1】
A.thusB.howeverC.thereforeD.otherwise
【小題2】
A.standB.flyC.hearD.sing
【小題3】
A.growthB.communicationC.healthD.survival
【小題4】
A.wideB.familiarC.crowdedD.special
【小題5】
A.developedB.improvedC.lostD.proved
【小題6】
A.partsB.habitsC.waysD.tools
【小題7】
A.wildB.interestingC.rareD.flightless
【小題8】
A.Instead ofB.Because ofC.BesidesD.Unlike
【小題9】
A.quicklyB.carefullyC.differentlyD.gradually
【小題10】
A.shapeB.color C.bone D.skin
【小題11】
A.ifB.andC.butD.so
【小題12】
A.helpB.feedC.protectD.hide
【小題13】
A.killB.noticeC.confuseD.frighten
【小題14】
A.dawnB.darknessC.dangerD.food
【小題15】
A.lookB.escapeC.moveD.fight
【小題16】
A.successfulB.naturalC.unusualD.positive
【小題17】
A.realizedB.actedC.stoppedD.arrived
【小題18】
A.broughtB.foundC.boughtD.hunted
【小題19】
A.providedB.formedC.destroyedD.controlled
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