单项选择题

The word "profligacy" ( line 1, para. 3 ) most probably means______

A．wastefulness
B．carefulness
C．profitability
D．economy
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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
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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