Answer :
In the order to make the following sentence true, the word 'acquisition' should be replaced by the word 'recovery'.
The given sentence is:
Spontaneous acquisition is the return of a previously extinguished conditioned response.
This sentence makes no sense because the word acquisition does not fit the meaning of the sentence. The correct sentence will be formed if we replace the word acquisition with recovery.
Therefore, the correct sentence will be:
Spontaneous recovery is the return of a previously extinguished conditioned response.
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