单项选择题

What's the main idea of the second paragraph______

A．Fossil energy was once very cheap
B．Farms in dry areas could get cheap water
C．Most American farmers used too much fertilizer and pesticide
D．Mainstream American agriculture used to be wasteful of energy, water and land
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单项选择题
It can be seen from the passage that the problem of resource conservation in agriculture______
A．has been solved in the U. S.
B．has not yet been paid any attention to
C．is being seriously and effectively dealt with
D．will soon be solved by using more capital and land
单项选择题
According to the passage, which of the following is NOT true______
A．The farming model and the way of life on diversified farms are workable
B．Large "organic" farms use large amounts of pesticides and synthetic fertilizers
C．The new adaptive farms are capable of resource-conserving practices
D．To reduce soil erosion is a resource-conserving practice
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