One day, a young man asked Albert Einstein, the great German scientist, （1） the secret of success was. The scientist told him that the secret of success is hard work. A few days later, the young man asked him the （2） question again. Einstein was very disappointed . He did not say anything , but wrote a few （3） on a piece of paper and handed it to the young man. The young man looked at the piece of paper. On it was written: A=X+Y+Z." What （4） this mean?" asked the young man." A means success," answered the old scientist. "X means hard work, Y means good methods, and Z means （5） talking and start to work . （2）.（ ）

A.words

B.what

C.stop

D.does

E.same