Why did one scientist expose birds to artificial daylight?

Why did one scientist expose birds to artificial daylight?

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规律的客观性是指(  )

规律的客观性是指(  )

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人类认识的基础是(  )

人类认识的基础是(  )

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推荐信的真实性的确定方法不包括(  )。

推荐信的真实性的确定方法不包括(  )。

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The phrase“they do the chewin9”makes the rocks seem as thoug

The phrase“they do the chewin9”makes the rocks seem as though they are.

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