题目

 下列对质量守恒定律的理解错误的是(    ) A. 质量守恒定律只适用于化学反应，不适用于物理变化 B．质量守恒定律研究的内容仅是指“质量”，不能推广到其它物理量     C．催化剂可以改变其它物质的化学反应速率，有催化剂参加的反应也遵守质量守恒    定律 D．蜡烛燃烧后质量减轻，不符合质量守恒定律 D      Besides his famous speech “I Have a Dream”, Martin Luther King is still well known for his work of nonviolent movements for black people. In 1955, Martin Luther King won national recognition for his non-violent methods used in a bus boycott in Alabama. Under his guidance, this peaceful boycott changed the law which required black people to ride in the backs of buses. After his success, Dr. King used the same way in efforts to change other discriminatory laws. Dr. King urged Blacks to use nonviolent sit-ins, marches, demonstrations, and freedom rides in their efforts to gain full freedom and equalities. Arrested for breaking discriminatory laws, Dr. King went to jails dozens of times. He became a symbol around the world for people to protest peacefully against unjust laws. In memory of his work for peaceful changes, Dr. King received the 1964 Nobel Peace Prize, but his leadership was challenged as civil rights activists became more militant. In the late 1960s, he showed further opposition to the war in Vietnam and to economic discrimination. While planning a multiracial Poor People’s March for anti-poverty legislation, he was shot and killed in Tennessee. 68. What is the best title for the passage? A. The nonviolent methods of Martin Luther King Jr. B. Martin Luther King Jr.—Nobel Prize Winner C. The need to change discriminatory laws D. Martin Luther King Jr.—advocate (奋斗者) of Nonviolence 69. Which of the following is mentioned in the passage as a means by which Dr. King tried to turn his dream into realities? A. Store boycott.                  B. Congressional (国会的) debates. C. Peaceful marches.            D. Visits to jails (监狱). 70. It can be inferred that Martin Luther King Jr. was considered by the militants as being too ____. A. radical (激进的)      B. cross          C. neutral              D. mild