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设计一个弹出对话框页面，补全下面代码。

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使用HTML服务器端控件创建一个简单的Web应用程序，单击Red按钮将Web页的背景改为红色。补全下面代码。HTML 服务器控件

供暖管道设置坡度主要是为了排气。（）

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Choosethecorrect"Holiday"accordingtothedescription.Children dress in costumes (animals, monsters, cartoon characters) and go to houses in their neighborhood asking for candy.“Treat or Trick”

A. HalloweenDay
B. ChristmasDay
C. EasterDay
D. Valintine'sDay

The festival is celebrated on the 15th day of the 8th lunar month.

A. Spring Festival
B. Latern Festival
C. April Fool's Day
D. Mid-autumn Day