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题目材料：
Crop yields of grapes grown in greenhouses increase when the greenhouse air is enriched with carbon dioxide an effect that is enhanced by raising the growing temperature several degrees. Therefore, since the carbon dioxide content of atmospheric air will be increasing for the foreseeable future and since such carbon dioxide increases will result in raised temperatures worldwide, an increase in the average yield per acre for grapes grown in the open is likely over the next century.
Determining which of the following would be most relevant to evaluating the argument given?
-
A.Whether increasing carbon dioxide levels in greenhouses improves the eating quality of the grapes grown in the greenhouses
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B.Whether in the future the market for grapes will be
greater than it is now
-
C.Whether temperatures today often get so high in
regions where grapes are grown that the grapes
suffer serious damage
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D.Whether the use of greenhouses for growing grapes
serves research purposes only
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E.Whether the economic benefits that might be derived
from a major increase in world grape production
would outweigh any economic harm resulting from
negative health effects associated with increased
worldwide carbon dioxide levels
C显示答案
