阅读理解 （共 20 小题; 每小题 2分，满分 40分）
A
Nobel, who was born in Stockholm, is a great scientist famous for his dangerous experiments.
Nobel studied in the USA and then Russia between 1850 and 1859. After his return, he started researching into bombs. As is known, bomb is dangerous to life, but Nobel was working under that condition. Once a big explosion in his lab completely destroyed the lab and caused some deaths.
