A team of American scientists has found a treatment to protect humans from the deadly H5N1 flu virus, ________ brings great ________ to the world.

A．that; appearance

B．which; relief

C．which; advantage

D．that; profit

企业外部调研的方法主要包括( )。

A．获取口头信息

B．获取书面信息

C．外部环境预测

D．获取电话信息

E．专题性调研