Which of the following is a feature that the hammerhead shark shares with other sharks？
A. They have slender bodies.
B. They have wide lobes.
C. They use electroreceptors to detect prey.
D. They sense electric fields from far away.
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Through his study, Robert Gifford found that ______.
A. the three groups had similar responses to the photos of 42 large buildings
B. the architects generally rated buildings lower than lay people
C. the architects predicted precisely the preferences of lay people
D. no architect could predict the public tastes towards buildings accurately
The best title of this passage can be: ______.
A. Ethiopians and Hemoglobin
B. Ethiopians and the World-class Athletes
C. An Anthropological Study on Ethiopians
D. A Myth. Hemoglobin and the World-class Athletes among the Ethiopians
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.
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
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