在△ABC中，若sinA：sinB：sinC=m：（m+1）：2m，则m的取值范围是（ ）。
The young man _______in studying paid no attention to the outside world.
A．involved
B．involving
C．to be involved
D．being involved
* * 内侧癌
A．放疗 B．化疗 C．姑息切除术 D．扩大根治术 E．改良根治术
