题目内容

According to the hedonistic approach, good welfare consists of a life-long presence of pleasant mental states and, just as important, the __________ of unpleasant mental states.

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It is worth noting that it is difficult – if not impossible – to discern whether an animal acts the way it does due to certain preferences or because preferences are merely a means to reach a certain _______, namely the preferred mental state.

The theory of Perfectionism states that in order to have a good life one must realize certain genetically-based, species-specific potentials. In other words, the animal must be able to express its ________ in order for the animal to live a good life.

The Three Rs concept originated from the scientific community and is a widely accepted ____________ of policies on animal-based science around the world. Ethical animal use requires consideration of animal welfare needs.

In the 3Rs, whereas Replacement and Reduction have to be considered primarily in the planning phase of an experiment, ____________ has primarily to be implemented when handling the animal in practice.