You are creating a Windows Forms application by using the .NET Framework 3.5. You use LINQ expressions to read a list of customers from the following XML file. 
You need to obtain a list of names of customers who are 21 years of age or older. Which code segment should you use？（） 
- A、A
- B、B
- C、C
- D、D
正确答案:B
答案解析:有
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