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Some scientists think goldfish only have a three-second memory.
Which of the following details from the passage disputes this claim?
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The eagerness with which they dart for them proves them to be welcome.
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The ingenious Chinese make great pets of their gold-fish, and with patience teach them many tricks, such as eating from their hands, or rushing to be fed at the tinkle of a bell.
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Watching anxiously to see that the gold-fish did not injure it, what was his astonishment to see the "pumpkin-seed" dart furiously at the larger fish, which huddled themselves in a corner, or scurried hastily through the water to hide among the stones and mimic grottoes of the aquarium!
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The little ones are carefully kept apart from larger ones, for the gold-fish is a wicked cannibal, and devours its little brothers and sisters, and even its own children, whenever it has an opportunity.