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．They ran a high fever.B．They died from excessive bleeding.C．Their nervous system was damaged.D．They suffered from heart-attack.
A．They ran a high fever.
B．They died from excessive bleeding.
C．Their nervous system was damaged.
D．They suffered from heart-attack.
单项选择题
A．Use less sauce on the food.B．Serve some less expensive food.C．Make some of the meals less fattening.D．Stop serving hamburgers and fried chicken.
A．Use less sauce on the food.
B．Serve some less expensive food.
C．Make some of the meals less fattening.
D．Stop serving hamburgers and fried chicken.
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