Official 30 Lec 1
答题结果:0/6
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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 an began a new one

我的答案:

正确答案:B

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