A. immerse food in very hot or boiling water B. sterilize food C. remove air from the cans D. subject food to steam or boiling water 参考答案:C 答案解析:[分析] 这一题要求我们对细节认真阅读后再作出判断。文中第四段详细介绍厂真空包装。各种食品装入罐中后,将所有空气抽出,使外部压强高于内部压强。这样就是所谓真空包装了。所以最合适的答案应为C项。
第35题: [单项选择]Passage One Questions 26 to 28 are based on the passage you have just heard. A. Time. B. Memory. C. Habit. D. Textbook. 参考答案:B 答案解析:[听力原文] What is a great help in learning a language