题干

现有Fe、CuO、MgCl2、Ca(OH)2、稀H2SO4等五种物质,在常温下它们两两相互发生的化学反应有(   )

A:3个

B:4个

C:5个

D:6个

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答案(点此获取答案解析)

B

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    Twenty years ago, I drove a taxi for a living. One early morning, I1 a call for a taxi. When I arrived at the building, it was 2:30 a.m. and I found the building was dark except for the only light in a first floor window.

    Many drivers would just shout once or twice and then drove away, but I thought this 2 might need my help. So I walked to the door and knocked, “Just a minute,” answered a3, elderly voice. After a long time, the door opened. A small old man showed up before me,4a small bag. He kept thanking me for my5. “It's nothing,” I told him.

    “Oh, you're such a good man.” He said. When we got into the taxi, he gave me a (an)6, and then asked, “Could you drive through the city center?”

    “But it wasn't the7way.” I answered quickly. “Oh, I'm in no hurry.” He said. “I'm on my way to a hospital. I don't have any family left. The 8 says I don't have much time left.

    I 9 started the taxi and shut off the meter(计程器). For the next two hours, we drove through the city center. He showed me the building where he once worked. We drove10 the church where he got married. He would never forget that happy moment. Sometimes he'd ask me to slow down in front of a building and would sit11the darkness for a long time, saying nothing. When the sun began to rise, we drove in silence to the address he had given me. When we arrived,12 without thinking, I gave him a big hug. “You gave an old man a little moment of13. Thank you!” He said with tears in his eyes.

    I was completely lost in thought for the rest of the day. What would happen if I had refused to do14 I did? We always think that there are no15 moments in our lives, but great moments are just in what others may think small and unimportant ones!

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阅读文言文,回答问题

【甲】愚公移山

       太行、王屋二山,方七百里,高万仞。本在冀州之南,河阳之北。

       北山愚公者,年且九十,面山而居。惩山北之塞,出入之迂也,聚室而谋曰:“吾与汝毕力平险,指通豫南,达于汉阴,可乎?”杂然相许。其妻献疑曰:“以君之力,曾不能损魁父之丘,如太行、王屋何?且焉置土石?”杂曰:“投诸渤海之尾,隐土之北。”遂率子孙荷担者三夫,叩石垦壤,箕畚运于渤海之尾。邻人京城氏之孀妻有遗男,始龀,跳往助之。寒暑易节,始一反焉。

       河曲智叟笑而止之曰:“甚矣,汝之不惠!以残年余力,曾不能毁山之一毛,其如土石何?”北山愚公长息曰:“汝心之固,固不可彻,曾不若孀妻弱子。虽我之死,有子存焉。子又生孙,孙又生子;子又有子,子又有孙;子子孙孙,无穷匮也;而山不加增,何苦而不平?”河曲智叟亡以应。

       操蛇之神闻之,惧其不已也,告之于帝。帝感其诚,命夸娥氏二子负二山,一厝朔东,一厝雍南。自此,冀之南,汉之阴,无陇断焉。

【乙】卖蒜老叟

袁枚

       南阳杨二相公精于拳术,每至演武场传授枪棒,观者如堵。一日,有卖蒜叟,咳嗽不绝声,旁睨而揶揄之。杨大怒,招叟至前,以拳打砖墙,陷入尺许,傲之曰:“叟能如是乎?”叟曰:“君能打墙,不能打人。”杨骂曰:“老奴能受我打乎?打死勿怨!”叟笑曰:“垂死之年,能以一死成君之名,死亦何怨!”老人自缚于树,解衣露腹。杨故取势于十步外,奋拳击之。老人寂然无声,但见杨双膝跪地,叩头曰:“晚生知罪矣。”拔其拳已夹入老人腹中坚不可出。哀求良久,老人鼓腹纵之,已跌出一石桥外矣。老人徐徐负蒜而归,卒不肯告人姓氏。

      【注释】①睨:眼睛斜着看。②揶揄:出言嘲笑、讽刺。