◎ 题干
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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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Most birds find it safe to sleep in the trees, butthey have eggs or young chicks, they don't use a nest.[ ]A. whyB. howC. unlessD. where…”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。