题目

Anne felt very ________ because she couldn't meet her friends. A . lone B . alone C . lonely D . loneliness 答案：C10．有一扇形的铁皮，其半径为30cm，圆心角为60°，若用此扇形铁皮围成一个圆锥形的教具（不计接缝），则此圆锥的高是5$\sqrt{35}$cm．