单项选择题

A．To determine whether the Earth’’s temperature is going up.
B．To study the behavior of some sea animals.
C．To measure the depths of the ocean.
D．To measure the movement of waves in the ocean.
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单项选择题
A．A visit to a prison.B．The influence of his father.C．A talk with some miserable slaves.D．His experience in the war between France and Austria.
A．A visit to a prison.
B．The influence of his father.
C．A talk with some miserable slaves.
D．His experience in the war between France and Austria.
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