乌鱼 ____ a、章鱼
蜗牛 ____ b、螃蟹
蝴蝶 ____ c、蝙蝠
斑马 ____ d、海马
所有进行发酵的微生物都分解有机物
-- Look! The man is __________ the poster at the bus stop.
-- Let's go and stop him. We should keep our city clean.