题型：单选题 题类：模拟题 难易度：普通
黑龙江省哈尔滨市2020年中考英语模拟调研卷（三）
①you should wear the safety belt well
②you sit on any seat if it is available
③you can eat something to make your ears comfortable
④if you're tired, you can take a walk in the plane
⑤you should never keep an empty stomach to take a plane
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