用data步 给出各股票最后2日的收盘价。
60000 2002-01-04 15.01
60000 2002-01-05 12.01
60000 2002-01-06 13.01
60000 2002-01-07 14.01
60000 2002-01-08 14.01
60011 2002-01-04 15.01
60011 2002-01-05 12.01
60011 2002-01-06 13.01
60011 2002-01-07 14.01
60011 2002-01-08 14.01
60022 2002-01-04 15.01
60022 2002-01-05 12.01
60022 2002-01-06 13.01
60022 2002-01-07 14.01
60022 2002-01-08 14.01