The Yellow River is the cradle of the Chinese nation. Please design a slogan to protect the Yellow River:

1. The Yellow River has been polluted, are you still clean?

2. Don’t let the blood of our mother river be polluted anymore. There is only one Yellow River and only one mother. Let us protect ourselves. Mother River!

3. The Yellow River cannot stop rushing, and the blood of China cannot be tarnished!

4. The wind is roaring, the horses are braying, the Yellow River is roaring, the Yellow River is roaring ?Defend the Yellow River, defend North China, and defend the whole of China.