It’s suggested that everyone should at least one hour a day to keep fit.A. work forB. wor

问题补充：

It’s suggested that everyone should at least one hour a day to keep fit.

A. work for

B. work out

C. work at

D. work on

答案：

A. work for

(答案→)B. work out

C. work at

D. work on

解析：考查短语辨析。work for 为了什么工作， work out 算出，锻炼身体，work at 在上班，work on 从事，句意：据建议每个人应该一天至少锻炼一小时来保持健康。所以选B。