题目

The  Adulthood  Ceremony  was  held  in  the  school  lecture  hall              seats approximately 500 students. I.     where             B. whose             C. which            D. when 答案：C声音在空气中传播的速度与________有关，声音在金属中比在液体中传播的________，在空气中比在液体中传播的________（后两空填“快”或“慢”）．