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ListeningComprehensionPart1Directions:Therearetwonewsitemsinthissection.You’regoingtolistentotherecordingtwice,checkyouranswersasyoulistenthesecondtime.Newsone2.Howsoondidtheresearchersseepositiveresultsofdolphintherapy?

题型：单选题

选项

A. After 1 week.

B. After 2 weeks.

C. After 3 weeks.

D. After 4 weeks.

正确答案：B