This passage gives a general description of the advantages and disadvantages of a hybrid auto- mobile. A motorbike is a type of

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问题 This passage gives a general description of the advantages and disadvantages of a hybrid auto- mobile.
A motorbike is a type of hybrid because it uses two ______ to run.

选项

答案sources of power

解析 本题考查电动自行车属于混合动力交通工具的原因。What Makes it a “Hybrid”?下第一段为答案出处。综合第三句a其不意moped (a motorized pedal bike) is a type of hybrid because it combines the power of a gasoline engine with the pedal power of its rider和第一句对混合动力交通工具的定义,Any vehicle is a hybrid when it combines two or more sources of power不难得知该题答案。
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