每/日/金/句：Yuan Longping is an agricultural scientist who keeps as many as one billion people free from hunger.袁隆平是一位农业科学家，他使多达十亿人免于饥饿。
课前预习设计
自读课文 疏通文脉大意
Read the text on Pages 55～56 carefully and then choose the best answer.
1．Why did many farmers welcome chemical pesticides and artificial fertilisers involved in farming?
A．They can fight crop disease and increase production.
B．They harm both the land and people's health.
C．They can help produce rich soil.
D．They are not expensive.
2．What concerns many people about the use of pesticides?
A．Pesticides can damage the land.
B．Chemicals can stay in the soil for a long time.
C．Pesticides can kill harmful bacteria and insects.
D．Chemicals may make people ill and even cause cancer.
3．Why do organic farmers change the kind of crop grown in each field every year?
A．It can help put important minerals back into the ground.
B．It can avoid damage to the environment.
C．It can help increase output.
D．The writer doesn't tell us.
4．What is the author's purpose of writing the text?
A．To call on farmers to turn to organic farming.
B．To introduce some good ways to make the soil rich.
C．To urge the government to stop using pesticides.
D．To give some advice on how to increase the output of crops.
