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    Oxygen can be ________ water.


    1. A.
      divided by
    2. B.
      divided into
    3. C.
      separated by
    4. D.
      separated from
    D
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    科目：高中英语 来源：101网校同步练习　高一英语　外语教学与研究出版社 题型：050

    阅读理解：

    　　Your blood makes a round trip through your body in less than a minute, thousands of times a day．It travels through tubes called blood vessels．There are three main kinds of blood vessels－arteries, veins, and capillaries(毛细血管)．When blood is pumped out of your heart it goes into your largest arteries．These branch into smaller arteries, which branch into still smaller ones．The blood flows from the smallest arteries into your capillaries．

    　　Capillaries are bridges between your arteries and your veins．They are the tiniest blood vessels, so small that you cannot see them without a microscope．Blood travels from the capillaries into tiny veins．These lead to larger and still larger veins．Finally, the largest veins take the blood back to your heart．

    　　Blood feeds your cells, cleans them, and works to keep them healthy．It carries food and oxygen to every cell of your body．The food and oxygen get into your cells by passing through the thin walls of your capillaries．

    　　Blood cleans all your cells by picking up wastes from them．The wastes pass from your cells, through the capillary walls, into your blood．The wastes called urea and uric acid are carried by the blood to your body and urine．The waste gas called carbon dioxide is carried by the blood to your lungs．It leaves your body when you breathe out．

    　　Blood also protects you．It has special cells in it that fight germs．The cells in your blood that fight germs are called“white cells”．These are like an army for your body．They kill harmful germs that get into your blood．When a large number of germs enter your body, the number of white cell“soldiers”grows．A lot of blood moves to the area where the germs are．The white cell soldiers attack the germs and kill them．The used white cells and dead germs form the thick yellow liquid called pus．If the pus is inside a sore on your skin, it may leak out．

    (1)

    How many round trips may your blood make through your body a day?

    [　　]

    A．

    500 times．

    B．

    1 000 times．

    C．

    1 440 times．

    D．

    1 500 times．

    (2)

    How does blood travel around your body?

    [　　]

    A．

    arteries-capillaries-veins

    B．

    capillaries-veins-arteries

    C．

    veins-capillaries-arteries

    D．

    capillaries-arteries-veins

    (3)

    Which one is TRUE?

    [　　]

    A．

    Blood can only protect you．

    B．

    All the cells in the blood can fight germs．

    C．

    Carbon dioxide leaves your body when you breathe out．

    D．

    The food and oxygen can pass through the capillaries, but wastes can’t．

    (4)

    Which topic isn’t mentioned in the article?

    [　　]

    A．

    How does blood travel around your body?

    B．

    Why do you need blood?

    C．

    How do your special blood cells fight germs?

    D．

    What are germs?

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    Everyday rubbish could provide a valuable source of energy thanks to a clever new invention. Smelly methane（沼气）gas expelled from landfill sites containing tones of rotting household waste could be used to produce a valuable energy resource. In Europe alone land fill tips produce 94 billion cubic meters of methane per year but currently only one percent of what could be a valuable source of energy is used, the rest is burnt off to prevent an explosive build up of gas.

    Methane gas forms when organic matter breaks down and is drawn off from large rubbish tips by pipes sunk into the middle of the waste. Until now this process wasn’t possible on small sites because the pipe allowed oxygen to seep in and that stop the breakdown process.

    Viktor Popov of the Wessex Institute of Technology has now developed a system to modify existing landfill sites by making them airtight while the methane is extracted from sunken wells. The site is covered by a special three-layered skin whose two outer layers are made of clay with a pressurized（加压的）layer of carbon dioxide gas in the middle. As the methane is sucked out through a central well it is replaced by carbon dioxide from the middle layer rather than oxygen, allowing the breakdown process to continue.

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    The passage mainly introduces ______ to us.

    A．how to make methane     B．a new way to make use of rubbish 

    C．the valuable things in rubbish  D．the amount of rubbish beig reused

    From the passage we can see that _____.

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    B．some of the waste will explode if it is not burnt off

    C．99% of the rubbish has been burnt off in Europe

    D．only a very small part of this kind of energy is used in Europe

    In the passage the underlined word “that” refers to ______.

    A．methane gas     B．the long pipe    C．oxygen     D．the rubbish

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    A．Oxygen can cause the breakdown process to stop.

    B．When the methane is sucked out, oxygen will enter from the middle layer.

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    科目：高中英语 来源：河南省郑州市智林学校2009-2010学年高二下学期阶段测试英语试题（二） 题型：阅读理解


    For years , many people would not believe that smoke could attack so many parts of the body in so many ways . Study shows , however , that tobacco isn’t one single thing .  At least 60% of it is gas—20 different kinds of gas . And one of these is the deadly carbon monoxide (CO) （一氧化碳）.
    In factories , the amount of this gas in the air is measured , and it must be kept under fixed , safe level . But there is 640 times this safe amount in cigarette smoke .
    Oxygen is carried through your body by the red blood cells . But this poison gas , CO, will get to the blood cells before the oxygen can . So , if you smoke your blood carries five to ten times more of this deadly gas than is normal . To make up for this , your body must make more red cells .
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    1．The gas amount in cigarette smoke is______________.
    A．640 times higher than the gas safe levels in factories
    B．640 times lower than the gas safe levels in factories
    C．640 times as much as that in factories
    D．as dangerous as that in factories
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    B．your blood carries much more CO than is normal
    C．you can have five to ten times of blood than usual
    D．your blood will be poisonous
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    C．breathe as much oxygen as non-smokers
    D．only get the same amount of oxygen at the sea level as non-smokers at an altitude of nearly 2 miles
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    科目：高中英语 来源：河南省2009-2010学年高二下学期阶段测试英语试题（二） 题型：阅读理解

     

    For years , many people would not believe that smoke could attack so many parts of the body in so many ways . Study shows , however , that tobacco isn’t one single thing .  At least 60% of it is gas—20 different kinds of gas . And one of these is the deadly carbon monoxide (CO) （一氧化碳）.

    In factories , the amount of this gas in the air is measured , and it must be kept under fixed , safe level . But there is 640 times this safe amount in cigarette smoke .

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    The oxygen in your blood passes into your tissues（组织）. But here again CO makes trouble . It keeps the oxygen from passing into your tissues as fast as it should . Because of this , cigarette country is always about 8000 feet above sea level . Someone who smokes and lives at sea level gets as little oxygen as a nonsmoker at an altitude（高度）of nearly two miles .This happens to everyone who smokes , no matter how old or how young . Anyone who competes in sports can tell you that those who smoke run out of breath more quickly than those who do not .

    1．The gas amount in cigarette smoke is______________.

    A．640 times higher than the gas safe levels in factories

    B．640 times lower than the gas safe levels in factories

    C．640 times as much as that in factories

    D．as dangerous as that in factories

    2．If you smoke , ______________ .

    A．your blood carries more oxygen than is normal

    B．your blood carries much more CO than is normal

    C．you can have five to ten times of blood than usual

    D．your blood will be poisonous

    3．Those who smoke______________.

    A．all live at sea level

    B．don’t live at an altitude of two miles

    C．breathe as much oxygen as non-smokers

    D．only get the same amount of oxygen at the sea level as non-smokers at an altitude of nearly 2 miles

    4．Smokers are______________.

    A．easily hurt                  B．easily excited      C．easily tired            D．healthy

     

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    科目：高中英语 来源： 题型：阅读理解

    For years , many people would not believe that smoke could attack so many parts of the body in so many ways . Study shows , however , that tobacco isn’t one single thing .  At least 60% of it is gas—20 different kinds of gas . And one of these is the deadly carbon monoxide (CO) （一氧化碳）.

    In factories , the amount of this gas in the air is measured , and it must be kept under fixed , safe level . But there is 640 times this safe amount in cigarette smoke .

    Oxygen is carried through your body by the red blood cells . But this poison gas , CO, will get to the blood cells before the oxygen can . So , if you smoke your blood carries five to ten times more of this deadly gas than is normal . To make up for this , your body must make more red cells .

    The oxygen in your blood passes into your tissues（组织）. But here again CO makes trouble . It keeps the oxygen from passing into your tissues as fast as it should . Because of this , cigarette country is always about 8000 feet above sea level . Someone who smokes and lives at sea level gets as little oxygen as a nonsmoker at an altitude（高度）of nearly two miles .This happens to everyone who smokes , no matter how old or how young . Anyone who competes in sports can tell you that those who smoke run out of breath more quickly than those who do not .

    1．The gas amount in cigarette smoke is______________.

    A．640 times higher than the gas safe levels in factories

    B．640 times lower than the gas safe levels in factories

    C．640 times as much as that in factories

    D．as dangerous as that in factories

    2．If you smoke , ______________ .

    A．your blood carries more oxygen than is normal

    B．your blood carries much more CO than is normal

    C．you can have five to ten times of blood than usual

    D．your blood will be poisonous

    3．Those who smoke______________.

    A．all live at sea level

    B．don’t live at an altitude of two miles

    C．breathe as much oxygen as non-smokers

    D．only get the same amount of oxygen at the sea level as non-smokers at an altitude of nearly 2 miles

    4．Smokers are______________.

    A．easily hurt              B．easily excited      C．easily tired          D．healthy

    查看答案和解析>>

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