题目

Louis Pasteur     Louis Pasteur, one of the world's great scientists, was born in 1822, and died in 1895.While still a young boy, Louis Pasteur made his decision to become a scientist. He spent much of his life time studying the diseases of cattle, chickens and other tame animals. His wife learned to help him with his work. Almost everyone knows that Pasteur is the man responsible for finding a way of preventing milk from spoiling (变质). Not many people know he was the first to imagine and to prove that air we breathe is full of germs (细菌).  One of his greatest successes was下列说法正确的是A.内力作用的能量主要来自太阳辐射能B.内力作用主要表现为地壳运动、岩浆活动、固结成岩等C.外力作用使地表变得起伏和缓D.外力作用强度较小，速度缓慢，内力作用激烈而迅速