According to Frank O'donnell, the effect of the enforcement of the Clean Air Act could ______.
A.
exceed Mr. Obama's economic budget greatly
B.
be overestimated by some environmental group
C.
hetp U. S. government get closer to its climate goal
D.
solve the climate problem on greenhouse gases
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参考答案:
举一反三
【单选题】______is the application of planned,systematic quality activities to ensure that the project will employ all processes needed to meet requirements.