'A dead patent' is one that _________ .
A.no longer wins money
B.has expired
C.is plagiarized
D.is violated

A.A.no
B.has
C.is
D.is

【参考答案】

B
解析：本题为细节理解题。据第3段第1、2句之间的意思联系(indeed提示后句为前句发展而来)可确定。