选正确的词或词组的正确形式填空

选正确的词或词组的正确形式填空
A组
disturbing,equip,circulate,output,reduce,struggle
1.Yuan Longping has____for Chinese farmers for the past five decades.
2.As a young man,he saw the great need for increasing the rice_______
3.At that time,hunger was a______problem in many parts of the countryside
4.He gives millions of yuan to______others for their research in agriculture
5.A heslthy soil______disease and helps crops grow strong and healthy
6.Yuan is_____his knowledge in less developed countries to increase their rice harvests
B组
thanks to,build up,lead to,focus on,keep...free from,would rather
1.He______keep time for his hobbies
2.Many of the chemicals can_______cancer or other illnesses
3.These chemicals in the food supply_______in people's bodies over time
4._____Yuan's research,the UNhas more tools in the battle to rid the world of hunger
5.Organic farming is simply farming without using any chemicala.They_____keeping their soil rich and free of disease
6.Organic farmers prefer using natural waste from animals.This____the air,soil,water and crops_____chemicals
C组
disturbing,expand,output,struggle,decada,equip
In the past__1__,some of the farmers in the west of China have met with some success in the__2__against the__3__desert.__4__with new scientific farming methods,they have been able to use less farmland than in the past.Their __5__of grain and other crops,however,is still the same.These and other farmers are starting to win small __6__in the great war against the__7__growth of the desert.