题目内容

听下面一段材料,回答第1-3题。
1. At what temperature should we start the freezing process?
A. Just below 0℃.
B. Between -15℃ and -20℃.
C. As low as possible.
2. How long can most foods be stored frozen?
A. For up to one year.
B. For half a year.
C. For 24 hours.
3. What shall we learn next week?
A. About canning food.
B. About removing water.
C. About how to unfreeze food.
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