单项选择题A．Drastic changes in the weather have been common since ancient times.B．The change in weather from very cold to very hot lasted over a century.C．The scientists have been studying ice to forecast the weather in the future.D．The past 10,000 years have seen minor changes in the weather.

填空题for — 删去for

填空题save

填空题as an hour — 改成whereas／while

单项选择题A．pressure from work can be reduced.B．working women can have more time at home.C．traffic and commuting problems can be solved.D．personal relationships in offices can be improved.