正确答案: D

动脉瓣关闭

题目：当心脏处于全心舒张期时（　　）

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学习资料的答案和解析：

[单选题]In which city was the bus boycott organized?

回答下面的题目 American Blacks experienced a revolution after 1945, a revolution in expectations． Following World War Ⅱ , the steady movement toward first-class citizenship for Black people quickened, with significant actions taking place in courts of law, in voting booths, in restaurants and in the streets of the nation． A decade of intense civil rights activity was launched in 1954 when the United States Supreme Court declared segregated schools to be unconstitutional． In 1955, Dr． Martin Luther King, Jr． , effectively organized the Blacks of Atlanta, Georgia, in a bus boycott． The boycott lasted two years, and when it was over, Blacks no longer were degraded by being forced to sit or stand in the rear of buses． In 1960, a group of Black college students decided that they, as well as white persons, had the right to eat at a lunch counter in Greensboro, North Carolina． This sit-in sparked an aggressive national movement and, in the next few years, thousands of young men and women--Black and White, North and South--overturned local laws and customs that had maintained segregation． Sit-ins, pray-ins, freedom rides, freedom marches and demonstrations to open all schools to Black children took place across the nation．Several important actions took place to change the status of black people

Atlanta．

解析：第二段。选项D是正确的。这是马丁·路德·金领导的一次为争取黑人平等的运动，该运动是所有黑人抵制公交公司，不乘坐他们的汽车，以求得废除黑人在公共汽车内只能在后排落座或站着的制度。英文的表达习惯是城市名在前，州名在后，中间通常用逗号隔开。Atlanta，Georgia是佐治亚州亚特兰大市。同样，Greensboro，North Carolina是北卡罗来纳州，格林斯伯罗市。但这个城市开展的是另一个运动。

[单选题]函数y=x2-1和y=1-x2的图像关于（　　） (A)坐标原点对称 (B)x轴对称 (C)y轴对称 (D)直线茗+Y=0对称