40. Einstein published his Special Theory of Relativity when he was__________.

　 A. in the United States.　　　　 B. in Ulm, Germany after he got his Ph. D

　 C. still at the University of Zurich at the age of thirty-six

　 D. still in Switzerland at the age of twenty-six

39. In 1933, Einstein went to live in the United States because ________.

　 A. he loved the USA more than his own country

　 B. he could no longer work in Germany when Hitler came into power

　 C. he wanted to live quietly in the USA

　 D. he had got some friends there with whom he could work together

37.　 A. offered　　　　 B. controlled　　　　 C. served　　　　 D. taught

36.　 A. important　　　 B. attractive　　　　 C. practical　　　 D. interesting

35.　 A. allowed　　　 B. recognized　　　 C. managed　　　 D. reduced

34.　 A. free　　　　　 B. different　　　　 C. full　　　　　 D. happy

33.　 A. an attempt　　 B. a decision　　　 C. a mistake　　　 D. an effort

32.　 A. promised　　　 B. admitted　　　　 C. wondered　　　 D. discovered

31.　 A. suddenly　　　 B. immediately　　 C. strangely　　　 D. nervously