有关继发性肝癌的叙述，下列错误的是（）。

A.血清AFP多为阴性

B.胃癌、结肠癌、胰腺癌为常见原发灶

C.可能为多发结节，但多数为单个结节

D.常以肝外原发癌肿所引起的症状为主要表现

E.诊断的关键在于查清原发癌灶

Which of the following best completes the passage below "Government" does not exist as an independent entity defining policy. Instead there exists a group of democratically elected pragmatists sensitive to the electorate, who establish policies that will result in their own reelection. Therefore, if public policy is hostile to, say, environmental concerns, it is not because of governmental perversity but because elected officials believe that

A．environmentalists would be extremely difficult to satisfy with any policy, however environmentally round.

B．environmental concerns are being accommodated as well as public funds permit.

C．the public is overly anxious about environmental deterioration.

D．the majority of voters vote for certain politicians because of those politicians’ idiosyncratic positions on policy issues.

E．(E) the majority of voters do not ply wish for a different policy.