????:1????????????:??????

2??????300??

3?????????????

4?????????

5???????????

???????2??2??????? ???(BBC)????????,??????????2???1??,??????????,????25%????????,????

???,??????????,?????1550?25%???????????????300?????????????2???????????????4???,1250?????????21??????

????,??,???????????????

?,??,???25%???????????????,??????????10%?

??????????????????????????????????????,???,???,??????????? ????????????:?????????????????