4.
补全对话。
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A. Sure.
B. Because they can't find enough food in winter.
C. It is an interesting book.
D. I am reading a book.
E. Why do the bears sleep in winter?
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Jill: What are you doing, Alice?
Alice:
Jill: Can we read it together?
Alice: It says wild geese change homes twice every year.
Jill: Why do wild geese change homes?
Alice: So they fly south in autumn.
Jill: Look at the bears. It says they sleep in winter.
Alice:
Jill: Because they don't need food when they sleep in winter.
Alice: