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    阅读理解

    　　About 200 million years ago, as the Triassic Period(三叠记)came to a close, many species of animals disappeared from the face of the Earth. Scientists had believed that the series of extinctions(灭绝)happened over a period of 15 to 20 million years. Recent discoveries in Nova Scotia suggest, however, that the extinctions may have happened over a much shorter period of time, perhaps less than 850,000 years.

    　　Evidence for a rapid extinction of species at the end of the Triassic Period is Found in the McCoy Brook Formation along the Bay of Fundy in Nova Scotia. Fossils(化石)found in this formation indicate a rapid disappearance of species rather than a slow and gradual change over time. One explanation for a relatively sudden extinction at the end of the Triassic may be that a large meteorite(陨石)struck the earth tit the time and was responsible for a 70-kilometer hole nearby. If geologists and other researchers can find evidence, such as shocked quartz(石英)in the rock formations, that a meteorite did strike the earth, it would give more credence to the theory of rapid Triassic extinctions. It is possible, however, that even if a rapid extinction happened in and around Nova Scotia, it did not necessarily occur in the rest of the world.

    (1)What is the main topic of this passage?

    [　　]

    A．The disappearance of animal species at the end of the Triassic Period.

    B．Evidence of a relatively sudden extinction of species

    C．The possibility of an extinction happening over a period of 15 to 20 million years.

    D．A meteorite hole in the Bay of Fundy in Nova Scoria.

    (2)The author uses the phrase“the face of the Earth”in Sentence 1, Paragraph 1, in order to ________.

    [　　]

    A．emphasize the disappearance

    B．focus on one part of the Earth

    C．focus on one period of time

    D．point out the reference to land, not water

    (3)According to the passage, what is the evidence that a meteorite struck the earth?

    [　　]

    A．A gradual change in species over time.

    B．A change in the quartz.

    C．Gold deposits in the veins of rocks.

    D．A change in the waters of the Bay of Fundy.

    (4)Which of the following best describes the author's tone?

    [　　]

    A．excited.　　　　　B．Explanatory.

    C．relatively.　　　　D．surprised

    答案：B;A;B;B
    解析：

    　　(1)第二段第一句是主题句。

    　　(2)强调消失得干干净净，face of the earth强调地球的任何地方。

    　　(3)见第二段第四句中，shocked quartz就能证明陨石撞击过地球。

    　　(4)本文是采用说明的手法是说理的。


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    科目：高中英语 来源：宁夏银川一中2011-2012学年高二上学期期中考试英语试题 题型：050

    阅读理解

    　　When you donate blood, a small amount is usually taken in advance to test your blood type．If you are O＋, the O is your ABO type and the＋is your Rh type．It is possible to be A,B,AB, or O as well as Rh＋or Rh-．

    　　The ABO system was discovered by Karl Landsteiner in the early 1900s．He was awarded the Nobel Prize for his achievements．There are four basic types of　blood in the ABO system：A,B,AB and O．Everybody is born with one of these four types of blood．We get blood type, just like hair color and height from parents．Because of the substances(物质)contained in each type, the four groups must be transfused carefully．If two different blood types are mixed together, it may put a person into an extremely dangerous situation．Basically, A and B cannot be mixed．A and B cannot receive AB, but AB may receive A or B．In an emergency, type O blood can be given because it is most likely to be accepted by all blood types，so it is often called the universal donor．However，there is still a risk．For the opposite reason，AB is sometimes called the universal receiver．However，because there can be so many reactions in transfusions，patients usually receive only salt until their blood can be matched as exactly as possible in the blood bank of the hospital．

    　　There is a relationship between your blood type and your nationality．Among the Europeans, about 45 percent have type O while 42 percent have type A．The rarest is type AB．Other races have different percentage．For example, some American Indian groups have nearly 100 percent type out of 100 donors in the world．

    (1)

    Which of the following shown the correct relationships in blood transfusions?

    [　　]

    A．

    B．

    C．

    D．

    (2)

    The underlined word “transfuse” most probably means ________．

    [　　]

    A．

    to put the blood into a container

    B．

    to move the blood from one place to another

    C．

    to put the blood of one person into the body of another

    D．

    to give power to another person

    (3)

    The text mainly tells us ________．

    [　　]

    A．

    about the basic types of human blood

    B．

    what kind of blood is the most common

    C．

    about Karl Landsteiner who won the Nobel Prize

    D．

    the relationship between blood type and nationality

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