Why do athletes often go to high altitudes to train？
A. Because they want to increase the amount of haemoglobin in their bodies.
Because it may help reduce the amount of red blood cells in their bodies.
C. Because they intend to learn more from the mountain dwellers.
D. Because it can help them to adapt themselves to the high altitude.
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From the passage we can infer that the faster our blood flows, ______.
A. the stronger we become
B. the weaker we become
C. the less nitric oxide we have
D. the lower levels of haemoglobin we have
The word "ambiguity” as used in the passage could best be replaced by ______.
A. risk
B. odds
C. uncertainty
D. knowledge
what is the author's attitude towards so-called entrepreneur？
A. positive
B. negative
C. praiseful
D. objective
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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