选择题：20 When are the visitors expected to ask questions? A During the lunch hour. B A

题目内容：

20 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

参考答案：

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How did George feel about Richard after his disappearance?A. He envied Richard’s marriage.B. He thoug

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