在熟悉课文《船长》的基础上填空：

课文选自____（国家）著名作家____的同名短篇小说。主要讲船长____在“诺曼底”号客轮遭到“____”号大轮船猛烈撞击之后即将沉没的时候，镇定自如，指挥60名乘客有秩序地乘救生艇脱险，自己却在____船长岗位上，随船一起沉人深渊的故事，歌颂了哈尔威船长____、____的精神。

    Last year, some groups of students in their community made a survey about “How do people spend their free time?” The following diagrams show some results of it:

    Diagram (1): Hours for people of different ages who surf the Internet in a week.

    Diagram (2): Different days people go to the library. ( library attendance )

    Diagram (3): Different sports people like.

D (1)                                         D(2)

D (3)

将边长为1的正方形ABCD，沿对角线AC折起，使BD=$\frac{\sqrt{6}}{2}$.则三棱锥D-ABC的体积为(　　)