单项选择题
A. Four age-groups were compared. B. Age 16-24 had the steadiest labour force. C. Age 25- 44 had the greatest increase in labour force.
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A. 30 washing machine were sold on Friday. B. 25 washing machine were sold on Monday and Thursday. C. 60 washing machine were sold on Saturday and Sunday. 4
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A. Four age-groups were compared. B. Age 16-24 had the steadiest labour force. C. Age 25- 44 had the greatest increase in labour force.