题目内容
（请给出正确答案）
A．Because farmers use less insecticides now.
B．Because farmers have been using insecticides for many years.
C．Because insects use the mechanisms against plants to fight insecticides.
D．Because insects have been eating plants for many million years.
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更多“A．Because farmers use less ins…”相关的问题
Why didn't the government' s expansion program work very well？
A．Because the farmers were uncertain about the financial support the government guaranteed.
B．Because the farmers were uncertain about the benefits of expanding production.
C．Because the farmers were uncertain whether foreign markets could be found for their produce.
D．Because the older generation of farmers were strongly against the program.
Why will American need to expoit food in 1997？
A．Because the farmers will need a lot of money.
B．Because it will need money to buy oil.
C．Because it will have too much food for its own use.
D．Because it wants to help other countries.
Why is fall busy for farmers？
A．Because they have to get in the crops and vegetables.
B．Because they have to get ready for spring planting.
C．Both A and B.
What causes the central problem that so much water is wasted mainly by farmers？
A．Because farmers can use water for agriculture free.
B．Because agriculture uses 75% of the world"s water.
C．Because most farmers are not aware of water shortage.
D．Because too many thirsty crops are grown in dry countries.
Why didn't the government's expansion programme work very well？
A．Because the farmers were uncertain about the financial support the government guaranteed.
B．Because the farmers were uncertain about the benefits of expanding production.
C．Because the farmers were uncertain whether foreign markets could be found for their produce.
D．Because the older generation of farmers were strongly against the programme.
Why didn' t the government' s expansion program work very well？
A．Because the farmers were uncertain whether foreign markets could be found for their produce.
B．Because the farmers were uncertain about the benefits of expanding production.
C．Because the farmers were uncertain about the financial support the government guaranteed.
D．Because the older generation of farmers were strongly against the program.
Why didn't the government's expansion program work very well？
A．Because the farmers were uncertain about tile financial support the government guaranteed.
B．Because the farmers were uncertain about the benefits of expanding production.
C．Because the farmers were uncertain whether foreign markets could be found for their produce.
D．Because the older generation of farmers were strongly against the program.
Why will American need to export food in 1997？
A．Because the farmers will need a lot of money.
B．Because it will need money to buy oil.
C．Because it will have too much food for its own use.
D．Because it wants to help other countries.
A．Because it is higher than the income of the average American families.
B．Because farmers have little money left after paying all necessary expenses.
C．Because the situation in small farms and large farms is quite different.
D．Because 2004 is the best year for farm families.
Why did the resistance of insects to man - made insecticides develop so rapidly？
A．Because farmers use less insecticides now.
B．Because farmers have been using insecticides for many years.
C．Because insects are using the mechanisms against poisons produced by plants to. deal with insecticides.
D．Because insects have been eating plants for many million years.
