1)在开头出现;

　　2)在结尾出现;

　　3)在开头和结尾同时出现，首尾呼应;

　　4)有些文章的中心思想贯穿全文，并没有用一句话明确表达出来，这就要求学生学会归纳概括。

　　(三)实战演练

　　16 During the summer you should be even more careful than usual of the foods you prepare. Foods spoil faster in hot weather than in cold weather. When you are shopping, purchase frozen and refrigerated foods, dont make long stops on your way home because frozen foods could become soft or warm. Using insulated bags helps keep food cold until you arrive home. Mild or milk products should be refrigerated immediately. When camping or picnicking or at any time when refrigeration isnt available, use special dry foods. Above all , if a food doesnt seem to be normal in odor or appearance, discard it immediately. Dont taste it.

　　What is the main idea of the passage?

　　A How to store frozen and refrigerated foods

　　B How to keep food from spoiling during the summer?

　　C How to select fresh food?

　　D How to prepare summer food

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