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第1题

Have you read the sign on the wall which says "No ___"? (Smoke)
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第2题

By 1830 the former Spanish and Portuguese colonies had become independent nations. The roughly 20 million of 1 these nat
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第3题

The idea that some groups of people may be more intelligent than others is one of those hypotheses that dare not speak i
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第4题

Research on animal intelligence always makes me wonder just how smart humans are. 1 the fruit-fly experiments described
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