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【参考答案】

as an hour — 改成whereas／while
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costly／expensive
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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.
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.
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