并列题名：Beethoven:his life and music with 21 activities Beethoven:his life and music with 21 activities Beethoven his life and music with 21 activities 版权页英文题名：Beethoven for kids:his life and music with 21 activities Beethoven for kids :：his life and music with 21 activities / His life and music with 21 activities Verdi for kids :：his life and music : with 21 activities / 牛顿的物理学世界：his life and ideas with 21 activities 达尔文的自然观：his life and ideas with 21 activities His life and times, with 21activities