Complete the summary below. Choose NO MORE THAN THREE WORDS AND/OR A NUMBER from the passage for each answer. Write your answers

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问题 Complete the summary below.
Choose NO MORE THAN THREE WORDS AND/OR A NUMBER from the passage for each answer.
Write your answers in boxes 10-13 on your answer sheet.
Freeze-drying prevents food from going bad by stopping the activity of microorganisms or 【R10】______.Its advantages are that the food tastes and feels the same as the original because both the 【R11】______and ______are preserved. The process is carried out slowly in order to ensure that 【R12】______does not take place. The people of one ancient mountain civilisation were able to use this method of food preservation because the conditions needed were present at 【R13】______.
【R13】

选项

答案high altitudes

解析 Paragraph 9: The extremely cold temperatures and low pressure at those high altitudes prevented food from spoiling...
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