单项选择题

We can infer from the passage______.

A．the ice can easily just slip into the ocean
B．volcanoes caused the ice to melt
C．melting just in the Northern hemisphere would have been impossible
D．researchers often use the computer models to help their research work

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单项选择题

The passage is mainly about______.

A．a computer model
B．studies which show ice melted equally in the North and the South during the ice age
C．most of the ice melted in the Northern hemisphere (半球) during the 30,000 year long ice age
D．a survey result

单项选择题

The scientists are not sure______.

A．how long the ice age lasted
B．where ice sheets (冰川) melted during the ice age
C．what caused the temperature changes
D．what the earth is made up of