Passage 2
You have been badly injured in a car accident. It is necessary to give you a blood transfusion because you lost a great deal of blood in the accident. However, special care must be taken in selecting new blood for you. If the blood is too different from your own, the transfusion could kill you.
There are four basic types of blood: A, B, AB and O. A simple test can indicate a person's blood type. Everybody is bom with one of these four types of blood. Blood type, like hair color and height, is inherited from parents.
Because of substances contained in each type, the four groups must be transfused carefully. Basically, A and B cannot be mixed. A and B cannot receive AB, but AB may receive A or B. O can give to any other group; hence, it is often called the universal donor. However, because so many reactions can occur in transfusions, patients usually receive only salt or plasma (liquid) until their blood can be matched as exactly as possible in the blood bank of a hospital. In this way, it is possible to avoid any bad reactions to the transfusion.
There is a relationship between your blood type and your nationality. Among Europeans and people of European origin, about 42 percent have type A while 45 percent have type O. The rarest is type AB. Other races have different percentages. For example, some American Indian groups have nearly 100 percent type O.
A good title for this passage is _____.
题干大意是：一个适合这篇文章的标题是 _。通读全文可知，文章首先通过事例引出血型这一话题，然后介绍四种基本的血型，即A型、B型、AB型和O型，接下来讲述了不同血型之间的接受关系以及血型与民族之间的关系。由此可推知，本文主要讲述的是人的血型。故选C。
People with type A blood can receive the blood of a donor with type_________ .
题干大意是：A型血的人可以接受一个________型血捐赠者的血。根据第三段第四句"O can give to any other group; hence, it is often called the universal donor."可知，0型血可以传输给任何血型，因此，O型血捐赠者被称为万能供血者。由此可推知，任何血型都可以接受O型血，所以A型血的人可以接受O型血捐赠者的血。故选C。
The word hence in Paragraph 3 probably means_________ .
题干大意是：第三段中的单词hence的意思很可能是__________。根据第三段第四句“0can give to any other group; hence, it is often called the universal donor.”并结合上题分析可知，0 cangive to any other group与it is often called the universal donor之间为因果关系。由此可推知，hence意为“因此”,四个选项中，C项(因此，所以)与其意思最为接近。always:总是，一直；nevertheless:尽管如此，不过，然而；seldom:不常，很少。故选C。
If you need a transfusion, the best and safest blood for you is _______.
题干大意是：如果你需要输血，对你来说最适合并且最安全的血是________。根据第三段最后两句"However,because so many reactions can occur in transfusions, patients usually receiveonly salt or plasma(liquid) until their blood can be matched as exactly as possible in the blood bank of ahospital. In this way, it is possible to avoid any bad reactions to the transfusion.”可知，因为在输血过程中可能会发生许多反应，所以病人一般只输盐水或血浆，直到他们的血型可以在医院的血库中完全匹配上，这样，就可能避免对输血的任何不良反应。由此可推知，输完全相同的血型是最好和最安全的。故选B。
We can infer from the passage that the third most common blood type of Europeans and people of European origin is___ .
题干大意是：从文章中我们可以推断，欧洲人和有欧洲血统的人的第三常见的血型是________。根据第二段第一句“There are four basic types of blood:A, B,AB and 0.”和最后一段第二、三句"Among Europeans and people of European origin, about 42 percent have type A...The rarest is type AB.”可知，共有四种基本的血型，即A型、B型、AB型和O型，而在欧洲人以及有欧洲血统的人中，有42%是A型血，45%是0型血，占最少比例的是AB型血。由此可推知，在欧洲人以及有欧洲血统的人，第三常见的血型为B型。故选B。