Which of the following index represents small-company stocks

A．The Dow Jones Industrial.

B．The Russell 2000.

C．The Wilshire 5000.

D．The S&P 500.

普查原发性肝癌最简单有效的方法是（）

A.B超

B.肝脏核素扫描

C.MRI

D.AFP测定

E.强化肝脏CT