2. 外语
  3. The passage is mainly about ______. If two persons’ blood types are different, that means they have different ______.

The passage is mainly about ______. If two persons’ blood types are different, that means they have different ______.

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问题 The passage is mainly about ______.
If two persons’ blood types are different, that means they have different ______.
选项 A、red cells in the blood
B、proteins on the red cells’ surfaces
C、parts of the blood other than the red cells
D、white cells in the blood
答案B
解析 分析推理题。由第二段的说明可知，血型是根据红细胞表面的抗原(特殊的蛋白质)是A抗原还是B抗原来区分的。
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