下列现象中不属于信息交流的是（　　）

请结合下图回答实验室制备气体的问题：

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“陕甘军民传喜讯，征师胜利到吴起”，诗句所描绘的情境发生在（    ）

阅读短文，判断正误，用“正确”或“错误”表示。

Little Jack is playing with his friend near a bank. A man stops beside them. The door

opens and a man gets out. He is wearing a mask. There's a gun in his hand. Little

Jack's friend is frightened. But Jack is not. He runs to a policeman. "Please come

quickly," Jack says. "A robber（强盗） is in that bank." The policeman looks at the bank and

laughs. "Oh, good boy！" the policeman says. "But it's Ok. That man is not a robber.

He's an actor.（演员）"