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 possib-高中英语-n多题

◎ 题干

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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