5（）
A. Because she likes to live near a playground.
Because the new apartment is cheaper.
C. Because she needs a quieter place.
D. Because the present apartment is too small.
Conversation 2 9（）
A. Black.
Brown.
C. White.
D. Gray.
指数平滑预测法中的平滑常数。数值越小，对数列的修匀效果越好。（）
A. 对
B. 错
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