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ORGANIC FARMING
(1)
Organic farming means growing crops ________ fertilizers．
A．
with chemical
B．
without chemical
C．
with
D．
without
(2)
The fertilizer that organic farmers prefer is ________．
natural waste from animals
chemical fertilizers
water
pests
(3)
Using chemical fertilizers can cause the following problems except that ________．
they affect the soil and water supply badly
they exhaust the soil
they kill both helpful and harmful pests
they make the soil richer
(4)
When farmers use ________ they keep the air, soil and water as well as the food supply free from chemicals．
fertilizers
chemicals
(5)
The main idea of the last paragraph is that organic farmers ________．
keep their soil rich and healthy in three ways
insist on changing crops every two or three years
plant seeds in different layers of the soil
plant grass between crops