At first Mr. Sally was ______ of planes, but two years later, ______ to other countries on business is his main business.

A．scared; flying

B．frightening; flight

C．frightened; flight

D．scaring; flying

工程量清单的项目设置规则是为了统一工程量清单的( )。

A．项目名称

B．项目编码

C．计量单位

D．项目特征

E．措施费计算规则