diff --git a/.DS_Store b/.DS_Store
index 6c405be..1a3301b 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 95e9e8a..2a7f445 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -2,7 +2,6 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="59588c1e-a8bb-477d-8940-a76753ba6132" name="Default" comment="">
-      <change type="DELETED" beforePath="$PROJECT_DIR$/assets/英语进阶学习方案.sketch" afterPath="" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/README.md" afterPath="$PROJECT_DIR$/README.md" />
     </list>
@@ -19,12 +18,12 @@
   <component name="ExecutionTargetManager" SELECTED_TARGET="default_target" />
   <component name="FileEditorManager">
     <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
-      <file leaf-file-name="README.md" pinned="false" current-in-tab="false">
+      <file leaf-file-name="README.md" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/README.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="510">
-                <caret line="33" column="3" lean-forward="true" selection-start-line="33" selection-start-column="3" selection-end-line="33" selection-end-column="3" />
+              <first_editor relative-caret-position="529">
+                <caret line="34" column="3" lean-forward="true" selection-start-line="34" selection-start-column="3" selection-end-line="34" selection-end-column="3" />
                 <folding />
               </first_editor>
               <second_editor />
@@ -32,12 +31,12 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="understanding.md" pinned="false" current-in-tab="true">
+      <file leaf-file-name="understanding.md" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/understanding.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="627">
-                <caret line="61" column="4" lean-forward="true" selection-start-line="61" selection-start-column="4" selection-end-line="61" selection-end-column="4" />
+              <first_editor relative-caret-position="335">
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                 <folding />
               </first_editor>
               <second_editor />
@@ -49,8 +48,8 @@
         <entry file="file://$PROJECT_DIR$/vocabulary.md">
           <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
             <state split_layout="SPLIT">
-              <first_editor relative-caret-position="2869">
-                <caret line="151" column="0" lean-forward="false" selection-start-line="151" selection-start-column="0" selection-end-line="151" selection-end-column="0" />
+              <first_editor relative-caret-position="152">
+                <caret line="8" column="0" lean-forward="true" selection-start-line="8" selection-start-column="0" selection-end-line="8" selection-end-column="0" />
                 <folding />
               </first_editor>
               <second_editor />
@@ -119,8 +118,8 @@
         <option value="$PROJECT_DIR$/speaking.md" />
         <option value="$PROJECT_DIR$/reading.md" />
         <option value="$PROJECT_DIR$/vocabulary.md" />
-        <option value="$PROJECT_DIR$/README.md" />
         <option value="$PROJECT_DIR$/understanding.md" />
+        <option value="$PROJECT_DIR$/README.md" />
       </list>
     </option>
   </component>
@@ -131,7 +130,7 @@
     <sorting>DEFINITION_ORDER</sorting>
   </component>
   <component name="ProjectFrameBounds">
-    <option name="x" value="951" />
+    <option name="x" value="640" />
     <option name="y" value="24" />
     <option name="width" value="1580" />
     <option name="height" value="991" />
@@ -262,15 +261,15 @@
       <workItem from="1496390664884" duration="3173000" />
       <workItem from="1496452977474" duration="3198000" />
       <workItem from="1496586872432" duration="1183000" />
-      <workItem from="1496628257303" duration="7380000" />
+      <workItem from="1496628257303" duration="8163000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="46591000" />
+    <option name="totallyTimeSpent" value="47374000" />
   </component>
   <component name="ToolWindowManager">
-    <frame x="951" y="24" width="1580" height="991" extended-state="0" />
+    <frame x="640" y="24" width="1580" height="991" extended-state="0" />
     <editor active="true" />
     <layout>
       <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.11816676" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
@@ -611,30 +610,30 @@
     <entry file="file://$PROJECT_DIR$/vocabulary.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="2869">
-            <caret line="151" column="0" lean-forward="false" selection-start-line="151" selection-start-column="0" selection-end-line="151" selection-end-column="0" />
+          <first_editor relative-caret-position="152">
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             <folding />
           </first_editor>
           <second_editor />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/README.md">
+    <entry file="file://$PROJECT_DIR$/understanding.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="510">
-            <caret line="33" column="3" lean-forward="true" selection-start-line="33" selection-start-column="3" selection-end-line="33" selection-end-column="3" />
+          <first_editor relative-caret-position="335">
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             <folding />
           </first_editor>
           <second_editor />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/understanding.md">
+    <entry file="file://$PROJECT_DIR$/README.md">
       <provider selected="true" editor-type-id="split-provider[text-editor;markdown-preview-editor]">
         <state split_layout="SPLIT">
-          <first_editor relative-caret-position="627">
-            <caret line="61" column="4" lean-forward="true" selection-start-line="61" selection-start-column="4" selection-end-line="61" selection-end-column="4" />
+          <first_editor relative-caret-position="529">
+            <caret line="34" column="3" lean-forward="true" selection-start-line="34" selection-start-column="3" selection-end-line="34" selection-end-column="3" />
             <folding />
           </first_editor>
           <second_editor />
diff --git a/README.md b/README.md
index 7abbeda..0f89bd1 100644
--- a/README.md
+++ b/README.md
@@ -26,8 +26,9 @@
 ![writing@2x.png](https://ooo.0o0.ooo/2017/06/05/59352828161b7.png)
 
 ## 从哪里开始
-
-- [listening.md](https://github.com/byoungd/english-level-up-tips-for-chinese-programmers-and-designers/blob/master/listening.md)
+- [认知篇](https://github.com/byoungd/english-level-up-tips-for-chinese-programmers-and-designers/blob/master/understanding.md)
+- [单词篇](https://github.com/byoungd/english-level-up-tips-for-chinese-programmers-and-designers/blob/master/vocabulary.md)
+- [听力篇](https://github.com/byoungd/english-level-up-tips-for-chinese-programmers-and-designers/blob/master/listening.md)
 
 >也许有些放弃的人会这样想：背那么多单词真的有意义吗？也许差别不是那么大吧？很多单词在生活中根本就用不到吧？
     
diff --git a/why.png b/assets/why.png
similarity index 100%
rename from why.png
rename to assets/why.png