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问题 多项选择题

时间序列的速度分析指标有（）。

A.发展速度

B.增长速度

C.平均发展速度

D.平均增长速度

E.增长量

答案

参考答案：A, B, C, D

解析：本题考查时间序列的速度分析指标。时间序列的速度分析指标包括发展速度与增长速度，平均发展速度与平均增长速度。

完形填空

Section C (8 marks)

There once was a farmer who grew award-winning corn. Each year he entered his corn in the state fair(集市) 小题1:___ it won a blue ribbon.

One year, a newspaper reporter interviewed him and learned 小题2:______ interesting about how he grew it. 小题3:______ reporter discovered that the farmer shared his seed corn(粮种) with his neighbors.

“How can you afford to do that when they are entering their corn in competition小题4:______

yours each year?” the reporter asked.

“Why sir,” said the farmer, “don’t you know? The wind picks up pollen(花粉) from the ripening corn and spreads 小题5:_____ from field to field. If my neighbors grow bad corn, cross-pollination will gradually reduce the quality of my corn. If I am to grow good corn, I must help my neighbors grow good corn.”

He is fully aware 小题6:_____ the connectedness of life. His corn can’t improve 小题7:______ his neighbors’ corn also improves. 小题8:______ it is with our lives.
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单项选择题

标准麻花钻的直径小于（）毫米时一般制成直柄。

A．10

B．13

C．15
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