单项选择题

A．The animals over-fertilize the soil.
B．Dead plant roots can’t hold the soil together.
C．The wrong types of plants are left standing.
D．There is a buildup of plant and animal matter.
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单项选择题
A．The author isn’t an expert in economics.B．She has a better theory about the economy.C．She isn’t sure that the author’s ideas would work.D．The author spends too much time arguing about details.
A．The author isn’t an expert in economics.
B．She has a better theory about the economy.
C．She isn’t sure that the author’s ideas would work.
D．The author spends too much time arguing about details.
单项选择题
A．It receives more nutrients than it can absorb.B．It becomes oversaturated with water.C．It loses the ability to support insect life.D．It loses nutrients that aren’t replaced.
A．It receives more nutrients than it can absorb.
B．It becomes oversaturated with water.
C．It loses the ability to support insect life.
D．It loses nutrients that aren’t replaced.
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