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英语DNA基础知识填空ThemodelofDNAisknownasadoublehelixbecauseitiscomposedoftwochainswrappedaroundeachother.

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英语 DNA基础知识填空
The model of DNA is known as a double helix because it is composed of two _______ chains wrapped around each other.
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答案和解析
single
DNA模型为双螺旋结构,因为它由两条单链相互缠绕而形成