在采用折衷准则进行决策时，乐观系数α的取值范围是()

A.-1<α<1

B.0<α<1

C.0.5<α<1

D.0<α<0.5

1. 在学校仍然不多的国家，教育是一种特权。

In countries where there are still not many schools,                               .

2. 他是位优秀的音乐家，听他演奏是一种荣幸。    

He is afine musician. It's                to hear him play.