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.
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单项选择题
A．How historical events affected an art movement.B．How artists can influence economic conditions.C．Why a certain art movement failed to become popular.D．How valuable paintings were lost during wartime.
A．How historical events affected an art movement.
B．How artists can influence economic conditions.
C．Why a certain art movement failed to become popular.
D．How valuable paintings were lost during wartime.
单项选择题
A．They left their pets with neighbors.B．They rented their house to a student.C．They hired someone to stay in their home.D．They asked their gardener to watch their house.
A．They left their pets with neighbors.
B．They rented their house to a student.
C．They hired someone to stay in their home.
D．They asked their gardener to watch their house.
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