2. 外语
  3. Forty-five percent of all blood donated in the United States is type O. Type O blood is essential for emergencies where there is

Forty-five percent of all blood donated in the United States is type O. Type O blood is essential for emergencies where there is

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问题 Forty-five percent of all blood donated in the United States is type O. Type O blood is essential for emergencies where there is no time for determining the blood type of victims because type O blood can be used for everyone. Type C)blood is unique in that it is compatible with blood of all types: any recipient, regardless of blood type, can be given it. But precisely because of this special usefulness, type O blood is chronically in short supply. If the statements in the passage above are true, which of the following must also be true?
选项 A、The special usefulness of type O blood lies in the fact that it matches the blood type of most people.
B、Supplies of type O blood are continuously so low that type O blood is unavailable for emergencies, where its usefulness would be greatest.
C、Forty-five percent of the total population of the United State has type O blood, which makes type O the most common blood type.
D、Any decision to give blood of any type other than O needs to be based on knowledge of the recipient’s blood type.
E、Type O blood is the only blood that cannot be typed as fast as needed in emergencies.
答案D
解析
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