Ladies and gentlemen, please fasten your seat belts. The plane _____ in five minutes. [ ]
A.
is about to take off
B.
is taking off
C.
takes off
D.
was taking off
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【单选题】The table gives some data on the supply of roses in a small town. When the price rises from $15 a dozen to $25 a dozen, the elasticity of supply is ________. (该表给出了一个关于一个小城镇玫瑰供应的数据。当价格从15美元上涨到25美元时,供...
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