题目

右图为空气成分示意图（按体积计算），其中“c”代表的是 A．氧气                             B．氮气         C．二氧化碳                         D．稀有气体 答案：AJohn H．Johnson was born in a family in Arkansas City in 1918．His father died in an accident when John was six．He was reaching high school age, but his hometown offered no high schools for the blacks．Fortunately he has a strong-willed and caring mother．John remembers that his mother told him many times, “Son, you can be anything you really want to be if you just believe．” She told him not to be dependent on others, including his mother．“You have to earn success”, said she, “all the people who work hard don’t succeed, but the only people who do succeed are those who work hard．”These words came from a woman with less than a third grade education．She also knew that believing and working hard don’t mean everything．So she worked hard as a cook for two years to save enough to take her son to Chicago．Chicago in 1933 was not the Promised Land that black southerners were looking for．John’s mother could not find work．But here John could go to school, and learned the power of words―as an editor of a newspaper．His wish was to publish a magazine for the blacks．While others discouraged him, John’s mother offered him more words to live by: “Nothing beats a failure but a try．” She also let him sell her furniture to get the 500 dollars he needed to start the Negro magazine．It’s natural that difficulties and failures followed John closely until he became very successful．He always keeps his mother’s words in mind．“Son, failure is not in your dictionary．” Now John H．Johnson is one of the 400 richest people in America―worth 150 million dollars．56．Why did John’s mother decide to move to Chicago? Because _____ ．A．life in Chicago would be better for the blacks than for the whitesB．John’s father died in his hometown when John was very youngC．there were no schools for the blacks in their hometownD．John needed education and he could go to high school there57．The underlined sentence in the fifth paragraph means ________ ．A．if you try , you will surely succeedB．a try is always followed by a failureC．only by trying can you get out of failureD．a failure is difficult to beat , even if you try58．We can learn from this passage that John’s mother ________ ．A．didn’t depend on others or give up easilyB．thought success only lied in a strong faithC．thought one could be whatever one wanted to beD．believed one would succeed without working hard59．What can be inferred from this passage?A．If someone wants to be successful, he should always stand firm．B．Chicago was not the Promised Land for the black southerners in 1933．C．John’s father died in an accident during the war．D．John’s mother was caring for him．