单项选择题

By way of explanation the man produced all the following proofs EXCEPT______

A．strange marks close to the hole
B．strange hot gas
C．a slightly burnt small tree
D．a tiny piece of metal in the hole
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单项选择题
According to the passage, which of the following is NOT wrong______
A．The computer experts should tell people everything about computers
B．David insisted that the computer clubs should open to all the people, including those non--experts
C．The foundation of computer town is a successful attempt to bring people closer to the computer
D．It is unnecessarily for all the people to become "computer-literate"
单项选择题
The author holds that the man's explanation was______
A．utterly infeasible
B．lacking in imagination
C．more probable than the one offered by the army
D．creative though not necessarily reasonable
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