成语“朝三暮四”源自（）A、《老子》 B、《庄子》 C、《列子》

第四节：改错（满分10分）

May I have you attention please? I have a little things to tell you. When you have a class here in the language lab, please be here a little early. Change your shoes before enter the lab. Don't bring anything here except your text books. When you are into, please don't touch these machine without permission. Always do as the teacher tell you to. In class you should only speak the English, not Chinese. Recorders can be used to making a copy of the listening materials. When class over, turn off your machines and leave the lab one by one.

对下列实验事实的解释正确的是[ ]

A．浓硝酸在光照条件下变黄，说明浓硝酸不稳定生成有色产物能溶于浓硝酸

B．在KI淀粉溶液中通入氯气，溶液变蓝，说明氯气能与淀粉发生显色反应

C．在某溶液中加入硝酸酸化的氯化钡溶液，有白色沉淀生成，说明含SO₄^2-

D．将铜片放入浓硫酸中，无明显实验现象，说明铜在冷的浓硫酸中发生钝化

患者工作中不慎被浓硫酸烧伤颜面部，最佳紧急处理措施( )

A．立即到医院就诊
B．立即用碱性溶液予以中和处理
C．立即用大量清水冲洗颜面
D．立即用大量清水冲洗颜面，勿忘冲洗眼部
E．立即打电话与急救中心联系

阅读《朋友四型》，回答下面的问题。

作者把朋友分为哪几类？

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圣彼得穹顶直径41.9m，仅次于（）。

A.万神庙

B.佛罗伦萨主教堂

C.巴黎圣母院

D.亚眠主教堂