The label on the packet read: "This product contains no artificial colouring or flavouring."
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1 .According to the passage, how did knowledge about chemical processes increase before the seventeenth century?
A Philosophers devised theories about chemical properties. B A special symbolic language was developed. C Experience led workers to revise their techniques. D Experts shared their discoveries with the public.
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A recognized B determined C solved D hindered
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A Problem B Material C Difficulty D System
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A continued B finished C revealed D enjoyed
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A Chemical knowledge was limited to a small number of people. B The symbolic language used was very imprecise. C Very few new discoveries were made by alchemists. D The records of the chemical processes were not based on experiments.
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