diff --git a/LinqStudy.Test/LinqToObject/TakeTest.cs b/LinqStudy.Test/LinqToObject/TakeTest.cs
index 32925ab..084bbe0 100644
--- a/LinqStudy.Test/LinqToObject/TakeTest.cs
+++ b/LinqStudy.Test/LinqToObject/TakeTest.cs
@@ -75,6 +75,29 @@ namespace LinqStudy.Test.LinqToObject
             //特别注意：值对象，比较值本身。
             Assert.Equal(2, person.Count);
         }
+
+        [Fact]
+        public void Test_3()
+        {
+            List<Person> perons1 = new List<Person> {
+                new Person { Id=1,Name="woody1"},
+                new Person { Id=2,Name="woody2"},
+                new Person { Id=3,Name="woody3"},
+                new Person { Id=4,Name="woody4"},
+            };
+
+            List<Person> perons2 = new List<Person> {
+                new Person { Id=3,Name="woody3"},
+                new Person { Id=4,Name="woody4"},
+                new Person { Id=5,Name="woody5"},
+                new Person { Id=6,Name="woody6"},
+            };
+
+            perons1.AddRange(perons2);
+
+            var cc= perons1.Distinct().ToList();
+            Assert.Equal(8,cc.Count);
+        }
     }
     
 }