A: Where have you been, Li Hai? I called you, but you weren't in.
B:
A:
B: I found that the factory was pouring waste water into the river near it. Lots of fish have died.
A:
B: Do you think “Greener China” can do something?
A: if they know about this thing, they will prevent it. Let's write to them at once.
B: I think everything will become better.
A. What did you do there? B. Good idea. C. Yes, of course D. That's terrible. E. I've been to a chemical factory |
Nearly all our food comes from the soil. Some of us eat meat, of course, but animals live on plants. If there were no plants, we would have no animals and no meat. So the soil is very necessary for life. The top of the ground is usually covered with grass or other plants. There may be dead leaves and dead plants on the grass. The waste matter (粪) from animals also falls on it.
All soil needs food. If we do not give it any, the plants will be weak. Farmers found that animals' waste is the best food for the soil, but chemical fertilizers (化肥) are also very useful. The same crop (庄稼) should not be grown in the same place every year; it's better to have a different crop. A change of crop and the use of a good fertilizer will keep the land good.
