1．Why did farmers welcome artificial fertilisers at first?
A．Because they could fight crop disease.
B．Because they could increase production.
C．Because they were in widespread use.
D．Because they benefited people's health.
2．What can we learn about crops grown with chemical fertilisers?
A．They are rich in nutrition.
B．They are rich in essential minerals.
C．They are very tasty and nutritious.
D．They look beautiful on the outside.
3．How do organic farmers keep their soil rich?
A．By using natural waste.
B．By using chemicals.
C．By using minerals.
D．By using fresh water.
[答案] 1－3 BDA
