单项选择题
You need to select a class that is optimized for key-based item retrieval from both small and large collections.
Which class should you choose？（）
A.OrderedDictionary class
B.HybridDictionary class
C.ListDictionary class
D.Hashtable class
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You are developing a custom-collection class.You need to create a method in your class. You need to ensure that the method you create in your class returns a type that is compatible with the Foreach statement. Which criterion should the method meet？（）
A.The method must return a type of either IEnumerator or IEnumerable.
B.The method must return a type of IComparable.
C.The method must explicitly contain a collection.
D.The method must be the only iterator in the class. -
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最近，您已完成创建的应用程序使用应用程序配置文件。 此配置文件包含一段名为 EmployeeSection，其中包含雇员的元素。 您需要查看 EmployeeSection 元素的内容。 您需要确保 EmployeeSection 元素输出到控制台及其内容。 你应该做什么？（）
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You need to identify a type that meets the following criteria： Is always a number. Is not greater than 65，535. Which type should you choose？（）
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C.System.String
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