【华慧考博】考博英语每日一练(8.20)考博加油!
1. They continue to ______ about and enjoy themselves until they became tired.
A. stroke
B. stroll
C. stammer
D. string
2. The ratio of the work done by the machine ______ the work done on it is called the efficiency of the machine.
A. against
B. with
C. to
D. for
【专业词汇翻译】
1.世界数字教育大会
2.短视频内容标注






