Question

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

1. A.
   work for
2. B.
   work out
3. C.
   work at
4. D.
   work on

Answer 1

B
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。