填空题

The exact procedures, by which one can tell whether enough paint has been applied, are revealed in this text.

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NG
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In doing exterior painting, one usually pays more for the brushes for large areas than for those for detail work.
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The solution to the world's food problems depends on ______.
A．modern methods of farming
B．providing family farms
C．solving problems besides growing food
D．the help of "have" countries
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