单项选择题
您正在编写自定义字典。该自定义字典类名为MyDictionary。您需要确保该字典是类型安全的字典。您应该使用哪个代码段？（）
A.A
B.B
C.C
D.D
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WhatkindofobjectdoesthegenericDictionaryenumeratorreturn？（）
A. Object
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C. Key
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单项选择题
YouworkastheapplicationdeveloperatHi-Tech.com.YoucreateanewcustomdictionarynamedMyDictionary.ChoosethecodesegmentwhichwillensurethatMyDictionaryistypesafe？（）
A. Class MyDictionary Implements Dictionary （Of String，String）
B. Class MyDictionary Inherits HashTable
C. Class MyDictionary Implements IDictionary
D. Class MyDictionary End Class Dim t as New Dictionary （Of String， String） Dim dict As MyDIctionary= CType （t，MyDictionary） -
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YouworkasanapplicationdeveloperatCER-Tech.com.Cert-Tech.comusesVisualstudio.NET2005asitsApplicationDevelopmentplatform.Youaredevelopinga.NETFramework2.0applicationusedtostoreatype-safelistofnamesande-mailaddresses.Thelistwillbepopulatedallatonesfromthesorteddatawhichmeansyouwillnotalwaysneedtoperforminsertionordeletionoperationsonthedata.Youarerequiredtochooseadatastructurethatoptimizesmemoryuseandhasgoodperformance.Whatshouldyoudo？（）
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