GRE

简答题 As its name suggests,a box canyon is a small(i)___________ with steep walls on three sides,allowing entry or(ii)___________ from only one direction.Long ago,buffalo hunters might drive a herd into a box canyon,(iii)___________ trappingthem and making them easy to butcher.

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C,D,H.A gullet(choice B)is a body part,not a geographical feature.The other answers should be clear if you read the sentence aloud and substituteeach one in order.

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