用环刀法测得的密度是环刀内土样所在深度范围内的平均密度，它可以代表整个碾压层平均密度。()
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The author mainly describes ______ in the article.
A. the creation of glaciers
B. the classification of glaciers
C. the features of glaciers
D. what glaciers are
A．Airlines have changed from seeking profits to government-owned companies.B．Airlines
Airlines have changed from seeking profits to government-owned companies.
B. Airlines have changed from government-owned to independent companies.
C. Airline companies have broken away from the country.
D. Airline companies have changed to all private-owned companies.
Why does the author mention the formation of glaciers in Iceland and Antarctica in the third paragraph？
A. To show the temperature in the two places.
B. To show the environment in the two places.
C. To show the importance of temperature and the rate of snowfall in the formation of glaciers.
D. To show these two places contain the oldest glaciers in the world.
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