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【单选题】
The law of diminishing returns:A.
deals specifically with the diminishing marginal product of fixed input factors.
B.
states that the marginal product of a variable factor must eventually decline as increasingly more is employed.
C.
can be derived deductively.
D.
states that as the quantity of a variable input increases, with the quantities of all other factors being held constant, the resulting output must eventually diminish.
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举一反三
【简答题】并非机器出了故障,而是我还没学会操作。(not that ... but that)
【单选题】My wife was wa t ching TV while I ______ on the Internet.
A.
sea r ch
B.
was sea r ching
C.
sea r ched
D.
sea r ching
【单选题】They were listening to____ radio while I watched _____ TV.
A.
/; the
B.
the; /
C.
the/ the
D.
/;/
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