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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热门试题

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

A．needB．insistC．serveD．lack

A．need
B．insist
C．serve
D．lack