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In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/ passage and find out which of the four combinations is correct. 1. Straight As may be the wrong goal, suggests a new study that has determined learning is optimized when we fail 15% of the time. P. This is a concept that society has intuited for a long time, across a variety of domains — for instance, this just-outside-one’s-grasp learning is observable in video games, in which the player is encouraged or forced to a higher level of difficulty once a performance criterion has been achieved.  Q. In both cases, machines and animals learned the fastest when difficulty was such that the subject would be right 85% of the time and be wrong 15%. But researchers say their finding is likely applicable to humans.  R. Interestingly, it’s not a new concept — the “zone of proximal development,” a theory developed in the 1930s by psychologist Lev Vygotsky described the sweet spot of learning: when a student is faced with a challenge just beyond their ability to solve it alone. It’s a ‘Goldilock’s zone'. S. A ratio, developed by researchers at various universities was tested on computers via machine learning and applied to previous research looking into how animals learn.  6. If one is taking classes that are too easy and acing them all the time, then one probably isn’t getting as much out of a class as someone who’s struggling but managing to keep up. 
A passage is given with 5 questions following it. Read the passage carefully and choose the best answer to each question out of the four alternatives and click the button corresponding to it. Man's attitude to various animals changed many times in the course of centuries. From indifference or practicality, he went on to adoration and deification, and thento hatred. Ancient Egyptians, for example, highly appreciated the cat's ability to destroy rodents. The cat was much superior in this respect to the grass­snakes andweasels they had kept in their houses before. These proved unable to cope with hordes of rats which invaded Egypt from Asia. So the cat, a very useful animal, was ranked as a sacred animal and one of the most important animals, too. The goddess of the Moon, fertility and child­birth, Bast herself was portrayed by the Egyptians as a woman with a cat's head. Sumptuous temples were built to this goddess, where cats were kept in luxury and fed the choicest of foods. They had their own priests and votaries, more numerous as a matter of fact than any other sacred animal could boast. According to the Greek historian Herodotus, the festival in the city of Bubastis, which had a templededicated to cats, was attended by as many as 700 thousand, who brought their offerings to the goddess in the shape of figurines of her made of gold, silver andbronze and adorned with precious stones. The word 'deification' in the passage means _____ .