单项选择题

A．Someone spilled water on it.
B．Someone lost it.
C．It was made of low quality metal.
D．The standard for measuring had changed.
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A．To see what happened to the survivors of the disease.B．To study animals that can also get infected with the disease.C．To look for the plants that could cure the disease.D．To look for the plants that could cure the disease.
A．To see what happened to the survivors of the disease.
B．To study animals that can also get infected with the disease.
C．To look for the plants that could cure the disease.
D．To look for the plants that could cure the disease.
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