Update README.md

README.md

@@ -22,25 +22,46 @@ It contains **1,000 Chinese multiple-choice math problems**, each annotated with
 ## Dataset Structure
 
 ### Data Fields
-- `id`: unique identifier for each problem
-- `question`: the problem statement in Chinese
-- `options`: answer options for the multiple-choice question
-- `answer`: the correct option
-- `rationale`: detailed explanation for the answer
+- `qtype`: question type. In MathMC, this is typically `"CHOICE"` for multiple-choice questions.
+- `quest_stem`: the main question content.
+  - `quest_stem.text`: the problem statement in Chinese.
+  - `quest_stem.options`: a list of answer options.
+    - `bullet`: the option label, such as `"A"`, `"B"`, `"C"`.
+    - `text`: the content of the option.
+- `quest_ref`: reference answers and explanations.
+  - `quest_ref.texts`: the correct answer(s), stored as a list.
+  - `quest_ref.analyses`: the explanation(s) or rationale(s), stored as a list.
 
 ### Example
 
 ```json
 {
-  "id": "mathmc_0001",
-  "question": "在一组数中，最大的数是15，这组数的平均数不可能是（）。",
-  "options": {
-    "A": "7",
-    "B": "13",
-    "C": "27"
-  },
-  "answer": "C",
-  "rationale": "根据平均数的定义，平均数不会大于这组数中的最大值。由于最大值是15，因此27不可能是平均数。"
+    "qtype": "CHOICE",
+    "quest_stem": {
+        "options": [
+            {
+                "bullet": "A",
+                "text": "扩大到原来的10倍"
+            },
+            {
+                "bullet": "B",
+                "text": "扩大到原来的100倍"
+            },
+            {
+                "bullet": "C",
+                "text": "扩大到原来的1000倍"
+            }
+        ],
+        "text": "在计算7.2÷0.12时，需要把被除数和除数同时( ) "
+    },
+    "quest_ref": {
+        "texts": [
+            "B"
+        ],
+        "analyses": [
+            "根据商不变性质:被除数和除数同时扩大或缩小相同的倍数(0除外)，商不变;据此解答."
+        ]
+    }
 }
 ```