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

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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

单项选择题

The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. So scientists thought that______.

A．most of the ice melted in the Northern hemisphere
B．most of the ice melted in the Southern hemisphere
C．The North Pole is colder than the South Pole
D．The South Pole is colder than the North Pole