单项选择题

A．People working in a large factory.
B．People walking on crowded city streets.
C．An everyday activity in a small town.
D．A well-known historical event.
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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.
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.
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