The student had difficulties reading, he would furrow his brow while doing what on a line of the book? Choose the most suitable option to answer the above question. Options：  A. concentrating  B. concentration  C. acquiring knowledge  D. sleeping  E. written material
A

What does running after balls lead to? Choose the most suitable option to answer the above question. Options：  A. sweating  B. physical exertion  C. fitness  D. catching up with  E. sprinting
B

The inspector judged it to be a copy, it was not a what of the original artist? Choose the most suitable option to answer the above question. Options：  A. creation  B. hatred  C. paste  D. soft copy  E. unique
A