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Most birds find it ____ to sleep in the trees.

A. was safe            B. safe                      C. to be safe          D. being safe

 

【答案】

B

【解析】 略

 

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