选择题

1. What can we infer from the dialog that lead is?

　　A. A soft metal
 

　　B. A type of gasoline
 

　　C. A character in a play
 

　　D. A form of currency

　　答案： A. A soft metal

　　解析： Lead is commonly known as a soft metal. It is not a type of gasoline, a character in a play, or a form of currency.

填空题

2. Complete the sentence: According to the dialog, lead is ____________.

　　答案： a soft metal

判断题

3. True or False: Lead is primarily used as a form of currency.

　　答案： False

　　解析： Lead is not primarily used as a form of currency but rather as a soft metal in various applications.

论述题

4. Discuss the uses of lead as mentioned in the dialog.

　　Lead is mentioned in the dialog as a soft metal with various uses. Historically, lead has been used for plumbing, ammunition, and in batteries. Due to its malleability and resistance to corrosion, it remains valuable in these applications despite concerns over its toxicity. In the context of the dialog, it is not discussed as a currency or a character in literature but rather as a material with practical industrial uses.

总结

　　在对话中我们可以推断出，lead是一种软金属，主要用于多种工业应用，例如管道、弹药和电池。虽然在过去它曾用作货币，但如今更多地被用于其物理特性和化学稳定性。

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