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

2???????????

3?????????

4??????????

5?????????

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

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

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

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

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