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精英家教網 > 高中英語 > 題目詳情

He was about to tell me the secret _________ someone patted him on the shoulder.

   A. as            B. until                C. while                D. when

 

【答案】

D

【解析】考查固定結構。Be about to do sth when…正要做某事在這時出現了意料之外的事情。句意:他正要告訴我那個秘密在這時有人拍了他的肩膀。

 

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科目:高中英語 來源:福建省泉州一中2009-2010學年高二下學期期中考試英語試題 題型:閱讀理解


When we donate blood, a small amount is usually taken in advance for at least ABO and Ph systems typing. 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-.
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When we donate blood, a small amount is usually taken in advance for at least ABO and Ph systems typing. 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-.

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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 (物質) 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.

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