\ No newline at end of file
diff --git a/cs291/lesson-07/20a-diffuse-material.en-copy-2/index.html b/cs291/lesson-07/20a-diffuse-material.en-copy-2/index.html
deleted file mode 100644
index 8e997cc..0000000
--- a/cs291/lesson-07/20a-diffuse-material.en-copy-2/index.html
+++ /dev/null
@@ -1,28 +0,0 @@
-
-
-
-
-
-
-
-
解答:
-要讓表面變成受光影響的漫射材質,修改 createBall():
-
-
-
1
-2
-3
-
-
-
var material = new THREE.MeshLambertMaterial( { color: 0x80FC66, shading: THREE.FlatShading } );
-var ka = 0.4;
-material.ambient.setRGB( material.color.r *ka, material.color.g* ka, material.color.b * ka );
-
-
-
-
\ No newline at end of file
diff --git a/cs291/lesson-07/34-the-over-operator-quiz/index.html b/cs291/lesson-07/34-the-over-operator-quiz/index.html
deleted file mode 100644
index c520299..0000000
--- a/cs291/lesson-07/34-the-over-operator-quiz/index.html
+++ /dev/null
@@ -1,14 +0,0 @@
-
-
-
-
-
-
-
-
-
\ No newline at end of file
diff --git a/cs291/lesson-07/index.html b/cs291/lesson-07/index.html
index 59e6eb8..50e4863 100644
--- a/cs291/lesson-07/index.html
+++ b/cs291/lesson-07/index.html
@@ -49,7 +49,7 @@