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題目列表(包括答案和解析)


In 1997, I found myself in a situation I never thought I'd be in: alone and begging for money in New York. My father had been separated from our family, and my mother had  recently died from complications related to AIDS. What I remember most about such nights is lying on the cold marble floor and using my backpack for a pillow.
Even though I had lost my family,  I made choices every single day to turn my life around. There was the haven for homeless teenagers called the Door, a non-profit organization that provided me with guidance, medical care and food, all of which kept me going while I completed my homework in train stations and under hallway lights. Perhaps the most surprising help though, I did not seek out﹔it found me.  The New York Times told my story. In the weeks that followed, dozens of strangers reached out to me from all across the United States. At my high school, I began receiving handwritten letters of encouragement. Strangers showed up bearing clothes, books, and even hugs. Since the article mentioned I was applying to Harvard, one woman knitted a blanket for me.  She attached this note to the box it was posted in: "It gets cold in those dorms. May you warm yourself knowing that people care about you".
With the help of these people, my life today bears no resemblance at all to my life then. I graduated not only from high school but also from Harvard University.
Before these people — some of them nameless— I just didn't realize how good people could be. But now I do, and I can say that the people who helped me have forever changed me. They are the reason behind my decision to join the board at the Door so that I can be part of a small team of people opening a high school for homeless teenagers .They are the reason I dedicate my life to opening pathways for others. And they are the reason I travel around the world helping people transform their own lives.
【小題1】According to the passage, the author______________.
A.tried to change her life
B.often slept m friends’ homes
C.felt lonely because of her illness
D.felt quite desperate for her father
【小題2】What can we learn about the Door?
A.It helps the homeless teenagers.
B.It is an organization seeking profits.
C.It provides entertainment for children.
D.It reports the stories about the homeless.
【小題3】The 3rd paragraph mainly tells about                       .
A.how the author applies to Harvard
B.how the author struggles for her ideal
C.how The New York Times helps the author
D.how people help the author in different ways
【小題4】Which of the following is the correct order to describe the author's life?
a. The newspaper reported her story.
b. She graduated from Harvard University.
c. She slept on the cold floor at night.
d. She joined the committee at the Door.           
e. Her mother died from the illness.
A.d→e→c→a→bB.e→c→d→a→b
C.e→c→a→b→dD.b→c→d→e→a
【小題5】What can we learn from the last paragraph?
A.Patience is a virtue.
B.Love can be passed on.
C.Time waits for no man.
D.Honesty leads to success.

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A、B、C、D代表四種不同的元素,O是氧元素,假設(shè):
C+AO→A+CO   A+BO→B+AO  D+CO→C+DO
則四種元素的氧化物中________最不穩(wěn)定.

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下列各組物質(zhì)中,前者屬于混合物,后者屬于化合物的是( 。

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(2003?黃岡)初中學(xué)習(xí)了氫、氧、碳、鐵等元素的單質(zhì)及化合物的知識.請回答:
(1)由H,0,C,F(xiàn)e組成的常見化合物中,屬于酸性氧化物的是
CO2
CO2
,屬于無機(jī)含氧酸的是
H2CO3
H2CO3
,屬于堿的是
Fe(OH)3
Fe(OH)3
,屬于有機(jī)物的是
CH4 C2H5OH
CH4 C2H5OH
(只寫兩種)(以上各空均填寫化學(xué)式).
(2)氫氣作為高能燃料具有的3個(gè)優(yōu)點(diǎn)是①
來源豐富
來源豐富
,②
單位質(zhì)量的氫燃燒時(shí)發(fā)熱量大
單位質(zhì)量的氫燃燒時(shí)發(fā)熱量大
,③
燃燒后不產(chǎn)生污染
燃燒后不產(chǎn)生污染

(3)我國古代用墨寫的字雖年深日久仍不變色,其原因是
在常溫下,碳的化學(xué)性質(zhì)很穩(wěn)定
在常溫下,碳的化學(xué)性質(zhì)很穩(wěn)定
;冬天用煤火取暖,因排氣不良,易發(fā)生煤氣中毒,一氧化碳使人中毒的原因是
一氧化碳很容易跟血液里的血紅蛋白結(jié)合,使血紅蛋白結(jié)合氧氣的能力大大減弱
一氧化碳很容易跟血液里的血紅蛋白結(jié)合,使血紅蛋白結(jié)合氧氣的能力大大減弱
.潛水艇中須配備氧氣再生裝置,利用的是過氧化鈉(Na2O2)與(CO2)反應(yīng)生成碳酸鈉和氧氣,該反應(yīng)的化學(xué)方程式為
2Na2O2+2CO2=2Na2CO3+O2 
2Na2O2+2CO2=2Na2CO3+O2 

(4)早在西漢時(shí)期,就有“曾青得鐵則化為銅”的記載,其中涉及的反應(yīng)方程式為
Fe+CuSO4=FeSO4+Cu
Fe+CuSO4=FeSO4+Cu

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(1)有A、B、C、D四種可溶性化合物,它們分別由Ag+、Na+、Ba2+、Cu2+、Cl-、SO42-、NO3-、OH- 8種離子中的兩種組成(每種離子只選一次).將A、B、C、D四種化合物的稀溶液按以下方式混合后的現(xiàn)象為:(微溶物視為可溶物)
①A+B→白色沉淀 、贐+D→白色沉淀 、跜+D→藍(lán)色沉淀
寫出下列物質(zhì)的化學(xué)式,
A為
 
、B為
 
、C為
 
、D為
 

(2)如圖中的各物質(zhì)均為初中化學(xué)常見物質(zhì).請根據(jù)如圖所示的關(guān)系回答:
精英家教網(wǎng)
①化合物甲的元素共有
 
種;
②反應(yīng)②的基本反應(yīng)類型為
 
;
③若常溫下乙為無色液體,則單質(zhì)C為
 
;反應(yīng)②的化學(xué)方程式可能為
 
;
④若常溫下乙為無色氣體,則單質(zhì)A為
 
;反應(yīng)②的化學(xué)方程式可能為
 

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