quiet in operation从Letter Two第二段可以得出此摩托车的优点为easy to start, quiet in operation and durable in service,因此答案应填quiet in operation。

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答案quiet in operation

解析 从Letter Two第二段可以得出此摩托车的优点为easy to start, quiet in operation and durable in service,因此答案应填quiet in operation。
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