riddle:why do birds fly south for winter
Why do birds fly south for winter\u4e3a\u4ec0\u4e48\u9e1f\u513f\u5357\u98de\u8fc7\u51ac
ies\u662f\u7279\u6b8a\u53d8\u590d\u6570 \uff0c\u8fd9\u91cc\u7684bird\u4ee5\u786c\u8f85\u97f3\u7ed3\u5c3e\u4e3a\u4e00\u822c\u53d8\u5316\u53ea\u52a0s
Because it's too slow to walk there.???
我小学毕业你说的什么我NO指导
the reason ?south is warmer than north in winter.cofcouse ,it's in china
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