Official 30 Lec 1
Question 3 of 6
In the dolphin study, how did the researcher make the dolphin's task increasingly difficult?

A.

By showing the dolphin two patterns that were similar in density

B.

By playing two sounds that became progressively closer in pitch

C.

By producing sounds that were just within the dolphins' range of hearing

D.

By introducing a third paddle that ended on trial and began a new one

正确答案:B

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