单项选择题

The period immediately following the Civil War was a time of great hope for Blacks in America. It was also a time of momentous (21) change, as the nation sought to (22) those liberties enshrined in the Bill of Rights to all Americans, Black and White. The Thirteenth Amendment (23) slavery, the Fourteenth Amendment guaranteed all citizens equal protection of the laws, and the Fifteenth Amendment declared that no one could be (24) the right to vote " (25) race, color, or precious condition of servitude." In subsequent decades, (26) , it became all too apparent, at least to Blacks and a (n) (27) small number of concerned Whites, that the promise contained in these amendments were not being (28) By century’s end, racial segregation was still an inescapable fact of American life, in the North (29) the South.
There was an important stage that showed the struggle to close the gap between constitutional promise and social reality. In turning to civil disobedience (非暴力反抗), leaders (30) Martin
Luther King, Jr. made (31) possible for all victims of racial injustice to take action in a way that was direct and forceful, (32) also peaceable. And through the power of their mortal example, they soon won widespread support for their cause. (33) these developments, Congress took steps to (34) the full meaning of the Fourteenth and Fifteenth Amendments by passing the Civil Rights Act of 1964 and Voting Rights Act of 1965.
The enactment of these measures (35) marked the end of the civil rights movement. There was still much to be done.