单项选择题

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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单项选择题
A．The Gods of Rome.B．Ancient Beliefs.C．The Rhythm of the Universe.D．Gods in Our Words.
A．The Gods of Rome.
B．Ancient Beliefs.
C．The Rhythm of the Universe.
D．Gods in Our Words.
单项选择题
A．To check the accuracy of scales.B．To calculate the density of other metals.C．To observe changes in the atmosphere.D．To measure amounts of rainfall.
A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.
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