1 . 听下面一段独白,回答以下小题。
1. How can frozen food be kept cold at ordinary temperatures?A.By using bags. | B.By using water. | C.By using paper. |
A.Use special dry foods. | B.Never cook meat or eggs. | C.Keep milk in a cooler box. |
A.How to pick up fresh food. |
B.How to eat healthily in different weather. |
C.How to keep food from going bad in summer. |
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