问题 单项选择题

On May 29, 1973, Thomas Bradley, a black man, was elected mayor of Los Angeles. Los Angeles is the third largest city in the United States, with a population of three million. About sixteen percent of the city’s population are black.
News of this election appeared on the front pages of newspapers everywhere in the United States. Here is how one major newspaper reported the event.
LOS ANGELES ELECTS BRADLEY MAYOR UNSEATING YORTYBLACK WINS 56% OF VOTES
Bradley called his victory over Yorty "the fulfillment of a dream". During his childhood and youth, people had kept telling him, "You can’t do this, you can’t go there, because you are a Negro. " Nevertheless he had won a decisive victory over a man who had been won 43.7 percent.
Los Angeles voters have had many opportunities to judge. Thomas Bradley had to form an opinion of him. The son of a poor farmer Texas, he joined the Los Angeles police force in 1940. During his twenty-one years on the police force he earned a law degree by attending school at night. He was elected to the city council ten years ago.
At the time of the Los Angeles election, three other American cities already had black mayors, but none of those cities had as large a population as Los Angeles. Besides, the percentage of blacks in those other cities was much larger. Cleveland, Ohio, had thirty-six percent black when Carl Stokes was elected mayor of Cleveland in 1967. In the same year Richard Hatcher was elected mayor of Cary. In Newark, New Jersey, sixty percent of the population were black when Kenneth Gibson was elected in 1970. Thus election of a black mayor in those cities was not very surprising.
In Los Angeles thousands of white citizens voted for Thomas Bradley because they believed he would be a better mayor than the white candidate. Bradley had spent forty-eight of his fifty-five years in Los Angeles. Four years ago Bradley lost mayoral election to Yorty. This time Bradley won.

Bradley hit the front page headline for ______.

A. he was the first black mayor in history
B. he was the first black mayor in the south of the USA
C. he was the first black mayor of one of the largest cities in the USA
D. a poor farmer’s son could also win an important election

答案

参考答案:C

解析: 细节题。根据倒数第2段第1句...three other American cities already had black mayors, but none of those cities had as large a population as Los Angeles. 可推知此题的答案。故选C。

单项选择题

全球现有活火山600多座,其活动程度可分为喷溢、喷发、爆发3个等级。火山爆发是极强烈的火山活动,范围更大的火山爆发则会给地球环境及生物造成大灾害。

火山爆发除了直接灾害外,还可能引起区域性、全球性气候异常,带来其他自然灾害。1991年我国华东地区出现了百年不遇的特大洪水,专家们分析后认为:菲律宾皮纳图博火山大爆发引起了亚洲广大地区天气异常,这可能是洪水爆发的主要原因之一。另据美国地质学家兰皮诺和考古学家安布罗斯考证,现印尼苏门答腊岛上的多巴火山,在7.1万年前曾有过一次极其强烈的爆发。那次火山爆发向大气层喷出了800立方千米的火山灰,使北半球1/3地区持续几个星期笼罩在黑暗之中;然后是长达6年的冬季效应,北半球可能是 3/4的植物死亡;再后是长达千年的冰期,5万到7万年前的人口以及物种遗传变化的急剧减少,有可能是多巴火山大爆发造成的,不过,专家们又认为:像多巴火山这样强烈的爆发事件,在21世纪发生的可能性只有1/10000000,故此我们毋须过多担忧。

1999年4月,美国《科学》杂志报道,加利福尼亚大学伯克利分校的伦尼等研究人员,通过对美国新泽西州到西非的环大西洋火山岩的研究,提出了“火山爆发形成大西洋”的假说。他们认为:两亿年前,地球上曾发生过一次迄今为止最强烈的火山爆发,从而使位于现在大西洋位置的原始大陆(古代大陆)分裂为几个大洲,并形成大西洋。他们估计:这次火山爆发产生了巨大的熔岩流,其覆盖面积达700万平方千米,持续时间长达几百万年。这次火山爆发时间正好与三叠纪和侏罗纪的衔接相吻合,大约50%的海洋物种和一些爬行动物都遭到灭顶之灾,从而为后来恐龙的出现和兴盛创造了条件。不过,这一假说尚未得到证实。

下列标题中适合做本文标题的一项是()。

A.火山爆发的现象

B.火山爆发对地球的影响

C.火山爆发与气候变化

D.火山爆发与地球假说

单项选择题