单项选择题

The ______ of my paper on animal communication includes a book on whale songs.

A. biography
B. preface
C. introduction
D. bibliography
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单项选择题
Working under the new expert who always encourages creativity in young people, we have been ______ with better ideas in test design.
A. coming down
B. coming out
C. coming along
D. coming up
单项选择题
Most people would like to find apartments in this area. There are very few ______ apartments in the area.
A. free
B. vacant
C. empty
D. deserted
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