Question

4. —You must get a high income by doing that kind of job.

—Oh,my income's rather variable,but I earn 100 yuan a day.

   A. on average   B. in common

   C. in total   D. in all

Answer 1

4. A

4. A解析：on average“平均起来”，符合 句意。in common共同的;in total总计; in all总共。