问题 阅读理解

阅读理解。

     John H. Johnson was born in a black 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 school for blacks.

     Fortunately (幸运地) he had a strong-willed, 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 worked hard as a cook for

two years to save enough money to take her son-then 15-to Chicago.

     Chicago in 1933 was not the promised land (乐土) that black southerners were looking for. John's

mother and stepfather could not find work. But here John could go to school, and here he learned the power

of words-as an editor (编辑) of the newspaper at Du Sable High School. 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 pawn (典当) her furniture to get the $500 he needed to start the Negro magazine.

     It is natural the 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 vocabulary." Now John H. Johnson is one of

the 400 richest people in America.

1. Why did John's mother decide to move to Chicago? Because _____.

A. life in Chicago would be better for the blacks than for the whites

B. John's father died in his hometown when John was very young

C. there were no high schools for the blacks in their hometown

D. John needed education and he could go to school there

2. The underlined sentence in the fifth paragraph means _____.

A. if you try, you will surely succeed

B. a try is always followed by a failure

C. only by trying can you get out of failure

D. a failure is difficult to beat, even if you try

3. We can learn from this passage that John's mother _____.

A. didn't depend on others or give up easily

B. thought success only came from working hard

C. thought one could be whatever one wanted to be

D. believed one would succeed without working hard

4. What can be inferred from this passage?

A. If someone wants to be successful,he should always stand firm.

B. Chicago was the promised land for the whites in 1933.

C. John's father died in an accident during the war.

D. John's mother was caring for him.

答案

1-4: CCAA

选择题
单项选择题

自然界有许多植物的叶子会动,比如含羞草、合欢等豆科植物白天张开叶子,晚上会合上叶子“睡眠”:捕蝇草的叶子能闭合起来,捕食苍蝇等昆虫。像含羞草、合欢等植物的这种“睡眠运动”自古以来就受到人们关注,可是植物为什么会睡眠,却一直是个[ 1 ]。
18世纪,法国生物学家德梅兰把含羞草放到光线照不到的洞穴里,发现它的叶子依然以24小时为周期开合。这说明含羞草体内存在一种不受外界光线等环境因素影响的“生物钟”。19世纪,达尔文在《植物的运动本领》中说,植物在晚上闭合叶子睡眠是“为了保护自己免受夜晚低温之害”。20世纪80年代,德国希尔德·奈希特的研究报告指出,叶子的开合是由一种称为“嘭压素”的植物激素控制的。此后,日本上田实等人从植物中抽出包含数千种化合物的萃取物,最后成功分离出两种活性物质,一种是可使植物叶子闭合的“安眠物质”,另一种是可使植物叶子张开的“兴奋物质”。
植物睡眠之谜之所以长期不得其解,就是因为此前没有人想到使叶子开合的竟是两种不同的生理活性物质。人们进一步了解到,豆科植物叶下珠的安眠物质是一种含葡萄糖的配糖体,白天配糖体水解,安眠物质浓度降低,夜晚配糖体重新合成,兴奋物质浓度相对降低,而配糖体的合成分解是由叶下珠体内的生物钟控制的。相反,铁扫帚的兴奋物质是配糖体,在夜晚配糖体水解,兴奋物质浓度降低,叶子随之闭合。如果用人工合成的半乳糖代替葡萄糖,由于半乳糖在铁扫帚体内不会水解,反而成为一种睡眠阻断剂,使铁扫帚始终不能睡眠,以致两个星期之后因缺水枯萎而死。
解开植物睡眠之谜,将为某种“绿色”农药的[ 2 ]铺平道路。目前的除草剂还无法只让田菁等豆科杂草枯萎而不损害豆科作物。研究人员已经人工合成了使田菁失眠的睡眠阻断剂,实验结果是田菁第三天就整株枯死。由于这种阻断剂只对田菁起作用,因此不会影响大豆的生长。

文中[ 2 ]应填入的词语是( )。

A.诞生
B.降临
C.出现
D.产生