题目内容

进来虽然有降雨，但气温并没有降多少，不少人仍然依赖空调过日子，而干眼症也“趁机上位”，让不少年轻人眼睛干涩刺痛。记者近日从多家医院了解到，近来就真的干眼症患者比以往增多，主要集中在上班族和青少年。专家介绍，干眼症本市中老年疾病，年轻患者增多与电子产品的大量使用以及用眼多度有关。看电视或电视屏幕，眨眼次数减少，眼睛得不到休滋润就易引发干眼症。长时间使用空调、空气干燥也是诱因之一。从上述文字刻制，下列有关“干眼症”的叙述错误的是：

A. 眨眼次数减少也容易引起干眼症
B. 使用空调是引起干眼症的诱因之一
C. 年轻人不会得干眼症
D. 大量使用电子产品容易引发干眼症

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You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application contains a composite user control that includes a TextBox control named txtInput. The user control will be hosted in a window and will have handlers for the text-changed event of txtInput. You need to ensure that the application meets the following requirements: Creates a text-changed event handler named Audit_TextChanged for the txtInput control. Executes Audit_TextChanged even when specific handlers mark the event as handled. Which code segment should you add to the constructor of the user control?（）

A. txtInput.TextChanged+=Audit_TextChanged;
B. AddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);
C. EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);
D. EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler (Audit_TextChanged), false)

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