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

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

3?????

4??????????

5????????

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

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

?,???,????

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

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