单项选择题

Holocene ______.

A．ended about 11,000 years ago.
B．is an existing geologic time period.
C．is the end of the Pleistocene epoch.
D．is an epoch of cool glacial and warmer interglacial periods.

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单项选择题Which of the following statements is TRUE according to the passage

A．96 percent of the earth's surface is covered by ice.
B．Over 10 million square miles of the earth's surface axe covered by ice now.
C．Almost all of the ice sheets covering the land and glaciers in the mountains have been hidden.
D．Most of the ice on the earth's surface is located in Antarctic and Greenland for the time bein

单项选择题What's the result of an accumulation of ice

A．An accumulation of ice would make the global climate system altered.
B．An accumulation of ice would make snow more difficult to melt.
C．An accumulation of ice would increase the amount of moisture in the air.
D．An accumulation of ice would increase the global temperatur