Animals should not be locked in cages; they should be in their normal _____.
A.environmentB.positionC.residenceD.dwelling
A
 environment(="surroundings," circumstances)環(huán)境,environment作集合名詞用時(shí),只用單數(shù)形式:We should work hard to improve our environment. (單詞,不可數(shù))Children need a happy home environment. (單數(shù),可數(shù))
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