单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Every other day.
B．Twice a week.
C．Twice a day.
D．Only during the summer.
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填空题
Snow and ice can balance Earth’s climate by ______, but the never-ending melting of snow and ice, could cause land and oceans to switch from ______to ______ surfaces.
填空题
The author holds optimistically that with the aid of our knowledge and technology, we will eventually be able to find ways to prevent sudden changes in climates and avoid natural disasters.
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