单项选择题

A．It can cause flooding annually.
B．It can carry diseases that affect animals.
C．It can introduce too much salt into the soil.
D．It can divert water from important crops.
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dramatically
单项选择题
A．To see what happened to the survivors of the outbreak.B．To study animals that can also get infected with the disease.C．To find out where the virus originates.D．To look for the plants that could cure the disease.
A．To see what happened to the survivors of the outbreak.
B．To study animals that can also get infected with the disease.
C．To find out where the virus originates.
D．To look for the plants that could cure the disease.
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