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.
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单项选择题
A．The homeowner is afraid of being accused.B．The house sitter pleads again and again.C．Most house sitters are very poor.D．The homeowner doesn’t want to bother.
A．The homeowner is afraid of being accused.
B．The house sitter pleads again and again.
C．Most house sitters are very poor.
D．The homeowner doesn’t want to bother.
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.
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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