When we donate blood, a small amount is usually taken in advance for at least AB

题文

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-.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 the four types of blood. We get blood type, just like hair color and height from parents. Becau of the substances(物质) contained in each type, the four groups must be transfud 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 becau 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, becau there can be so many reactions 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 O out of 100 donors in the world… 84 donors are Rh+16 donors are Rh-38 are O+7 are O-34 are A+6 are A-9 are B+2 are B-3 are AB+1 is AB-1. Which of the following shown the correct relationships in blood transfusions?  A B  A B    A   B  A  B AB O   AB O  AB O AB  O A B    C   D2. The underlined word “transfu” 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 person3. The writer suggests that the third most common blood type among the Europeans is ______. A. B   B. A    C. AB  D. O4 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 题型：未知难度：其他题型

答案

小题1:D小题2:C小题3:A小题4:A

解析

略

考点

据考高分专家说，试题“When we donate blood.....”主要考查你对 [日常生活类阅读 ]考点的理解。 日常生活类阅读

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日常生活这一话题主要涉及人们衣食住行等方面的活动。这一话题的选材主要针对人们日常的工作，生活以及学习情况。做这一类题时，最主要的是要把握好人物的活动内容，时间和地点。

日常生活类阅读题答题技巧：

【题型说明】该类文章内容涉及到人们的言谈举止、生活习惯、饮食起居、服饰仪表、恋爱婚姻、消遣娱乐、节日起源、家庭生活等。文章篇幅短小，追根溯源，探索各项风俗的历史渊源，内容有趣。命题也以送分题为主，如事实细节题、语义转换题、词义猜测题和简单推理判断题等。虽然这类文章读起来感觉轻松，试题做起来比较顺手，但绝不能掉以轻心。因为稍不留神，就会丢分。 【备考提醒】为了保证较高准确率，建议同学们做好以下几点： 1、保持正常的考试心态。笔者在教学中发现，越是容易的试题，同学们越是容易失分。为什么呢？因为在这种情况下，同学们极易产生麻痹思想，认为题目好做，就不引起高度重视，于是思维不发散、不周密。而命题人就是利用同学们的这一弱点，设计陷阱题。所以，无论试题难易与否，我们都要保持正常的考试心态。试题容易，不欣喜；试题难，不悲观。 2、根据前面讲到的方法，认认真真、细细心心做好事实细节题。 3、做好语义转换题。这类题是根据英语中一词多义和某些词语在文中能表达一定的修辞意义的原则而设计的。要求同学们解释某生词的含义，确定多义词或短语在文中的意思，确认文中的某个代词所指代的对象，或者对英语中特有的表达、格言、谚语进行解释。这种题要求同学们一定要根据上下文猜测词义或理解句子，切不可望文生义。 4、做好简单推理判断题。简单推理判断题要以表面文字为前提，以具体事实为依据进行推理，做出判断。这种推理方式比较直接，只要弄清事实，即可结合常识推断出合理的结论。