单项选择题

The polar regions are generally covered with ice and snow.

A. areas
B. rocks
C. mountains
D. seas
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单项选择题
Before herbs were available in supermarkets year-round, herb vinegar was made in the fall.
A. obtainable
B. affordable
C. reasonable
D. disposable
单项选择题
Mary has blended the ingredients.
A．made
B．mixed
C．cooked
D．eaten
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