how did they keep food cold before refrigerators

 

A refrigerator is one of the most important inventions ever created. In days gone by food would have to be eaten quickly, because there was no way of keeping it cool for long periods. Refrigerators, however, changed all that.

 

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In this article, we take a look at how our food would have been prepared up until the invention of refrigeration and what has changed since then. 

 

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We also find out why some foods are better than others for preserving before refrigeration came along and discover how the first modern-day fridge was developed.

 

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We hope you enjoy it!

6.3.3 Refrigerator

Text [to use as knowledge, not to be copied verbatim]:why is it important to clean out the refrigerator?

Text [to use as knowledge, not to be copied verbatim]:what is the purpose of a clean refrigerator?

6.4 Conclusion & Evaluation*

 

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This concludes Unit 6. We hope you enjoyed it. You have finished 12 articles and several texts; total 28 items now. Now we are going to evaluate your English listening and reading comprehension skills through multiple-choice questions (MCQs). 

 

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The test contains 20 MCQs from different topics in this learning unit. Choose the best English essay answer of 12. Please refer to Unit 5, page 65, for sample MCQs.

 

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You have shared a unit with your classmates, visit Unit 5’s teacher website and see how you compare with other students as well as how your scores are improving by clicking'Join Online Classroom' at the top-right corner of this unit’s webpage. 

 

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For students who want to compete in an online classroom competition against other students from all over the world, click 'Log-in To eClassroom (eLearning)'. After logging in, you will be able to see your scores and the scores of other students.

 

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If you have difficulty in answering the MCQs, go back and review the previous unit as well as do some exercises from our website. We also have listening practice materials that you can download at  (for students who like to listen to audiobooks).

 

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 To improve your reading speed and accuracy, visit http://www.cuenglish.net/reading-comprehension-training/.

 

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 For students who are interested in improving their writing skills, please visit the website below: .

 

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We will post 3 extra articles in this unit’s Learning Page. Please read them. You will have similar questions in the real IELTS exam. Feel free to check your progress anytime by clicking the ‘Test Your Readiness’ button at the top of this page.

 

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7. Grammar

Unit 7 is devoted to grammar. In this unit, we review grammar related to the following topics:

• writing skills (e.g., punctuation)

• explaining using context and examples (e.g., in context)

 

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• expressing emotions (e.g., feeling, tension) and opinions (e.g. persuade)

• nouns and noun expressions (e.g., pronouns, possessive adjectives) and their functions

7.1 Writing Skills*

 

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This unit will help you review and improve grammar related to writing skills. You will learn what to include in your essay when you are writing about interesting or difficult experiences, as well as how to organize your ideas effectively. We suggest that you learn the useful expressions in Table 7-1 and Table 7-2 by heart before you start practicing at Unit 7.1 through Unit 7.3.

 

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7.2 In Context

We are going to revise grammar related to expressing opinions (e.g., persuade).