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ListeningComprehensionPart1Directions:Therearetwonewsitemsinthissection.You’regoingtolistentotherecordingtwice,checkyouranswersasyoulistenthesecondtime.Newstwo4.WhatistheapproximatepercentageofgreenhouseemissionscausedbyenergyproductionintheUS?

题型：单选题

选项

A. 20%.

B. 30%.

C. 40%.

D. 50%.

正确答案：