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The happiness of human beings still depends on the tradition......

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A person who is really diligent has a great potential and is likely to develop and improve himself or herself even in the area that numerous people have tried before him or her．beaten 打败了的。
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The transgenic farm animals mentioned in this passage are ______.
A．pigs, cows and mosquitoes that have gone through the transgenic procedure
B．pigs, cows, sheep and chickens that have accepted additional genes
C．leaner pigs, poultry that produce pharmaceuticals and healthier sheep
D．leaner pigs, chickens resisting diseases and goats that produce milk with medicine in it
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