摘要: When are the visitors expected to ask questions? A. During the lunch hour. B. After the welcome speech. C. Before the tour of the labs. 第二部分:英语知识运用 (共两节.满分45分) 第一节:单项填空(共15小题,每小题1分.满分15分)从A, B, C, D四个选项中.选出可以填入空白处的最佳选项.并在答题卡上将该项涂黑.

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