This passage deals mostly with . Hunger is caused by .

admin2009-08-21 3

问题 This passage deals mostly with ______.
Hunger is caused by ______.

选项 A、too much food and water in the body
B、a lack of oxygen in the blood
C、seeing or thinking about food
D、a lack of certain chemicals in the blood

答案D

解析见原文第二段。当我们感觉饿时，说明我们的血液中缺少某种化学成分。

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英语

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