题目内容

The whole journey was a _________; we lost our luggage and we arrived two days late.

A. dream
B. daydream
C. nightmare
D. nightdream

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He gave up his seat on the bus to an old woman standing _________.

A. from
B. close
C. upon
D. nearby

Everyone learns best from his own _________.

A. experience
B. experienced
C. inexperience
D. inexperienced

2 包含趋势性、季节性或周期性的序列称为 ( )。

A. 平稳序列
B. 周期性序列
C. 季节性序列
D. 非平稳序列

4时间序列在一年内重复出现的周期性波动称为( )。

A. 趋势
B. 季节性
C. 周期性
D. 随机性