O——of them is water pollution.All kinds of things f___cars,factories,farms and homes make our
问题描述：
O——of them is water pollution.All kinds of things f___cars,factories,farms and homes make our
river,lakes and oceans dirty.
答
One
from第二句怎么翻译来自汽车，工厂，农场和家庭的各种东西使我们的河流，湖泊和海洋变脏