单项选择题

The main difference between the modem superfarm and diversified farms is______

A．their sizes
B．the machinery employed
C．the degree of dependence on resources
D．the kinds of crops cultivated and animals raised
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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
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"
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