单选题：One of the possible reasons for the zoo-raised elephants' pr

题目分类：理工类
题目类型：单选题
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题目内容：

One of the possible reasons for the zoo-raised elephants' problems is that __________ . A．they do not get proper food
B．they do too much exercise
C．they live in large herds
D．they do not live in family groups

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分类：理工类题型：单选题

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分类：理工类题型：单选题

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分类：理工类题型：单选题

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