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????2????7?????? ???,????????????????(2???????????????6????),??,??????????????????????????6~8??,?9~13??????;?????????????????????????????????????????????????????8??????????8?,????????????????????6~8???,??12~16?????????,???

??(7????????8????),?,??????????6~8??,????10????;????4~6?,??????????8~10?,??????????????10???????

??????,7??,??????5~6?????????????7~8??,??????,????????????????????????9~10??????????????????;???????????????????9?????????10~11??8?????,????,????????

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7??,?????????,???????????????????????

????,7???????8??????,??????????,????????;???????????????????????????????,?7?????,????????????????

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