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Clarke and her colleagues introduced bacteria to floor tiles (瓷砖) and then placed cookies on the tiles for varying times.
2018年12月四级真题（第三套）阅读 Section B
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In his teenage years, Careme fashioned eatable copies of the late 18th century's most famous buildings—cookies in the shape of ruins of ancient Athens and pies in the shape of ancient Chinese palaces and temples Sylvain Bailly.
2018年12月四级真题（第二套）阅读 Section B
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They reported bacteria were transferred from the tiles to the cookies within five seconds, but didn't report the specific amount of bacteria that made it from the tiles to the food.
2018年12月四级真题（第三套）阅读 Section B