Cynthia Beall is going to do more research on ______.A．why Ethiopians have more haemoglobi
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Cynthia Beall is going to do more research on ______.
A．why Ethiopians have more haemoglobin
B．why so many world-class endurance athletes are Ethiopians
C．whether the Ethiopians have different kind of haemoglobin
D．whether the Ethiopians have higher concentration of haemoglobin
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正确答案：B
解析： 最后一段最后一句话中的that指的是上一句话It might be why so many world-class endurance athletes are Ethiopian，所以the next study指的就是这一点。