Alcohol depresses the nerves , and the nerves affect almost every area of the body . Enough alcohol makes people sleep , so people who become unconscious choke on their own vomit (呕吐物) . Most worryingly , enough alcohol can shut down those parts of the brain just like any other parts. People become unconscious and their brains simply forget to breathe.

　　Alcohol is broken down in the liver. Alcohol doesn’t destroy the liver , but products that the liver breaks the alcohol into do cause damage. A glass of wine per day can not do any harm . Instead , it can prevent heart attacks or can make someone functionally young. And it is kind of nice to know that sometimes, relaxation and cheer can be bottled . All that’s needed is to take care how much alcohol is let into a person’s brain .

　　28.How does the author introduce the topic of the text ?

　　A. By statement .

　　B. By question .

　　C. By arguing .

　　D. By explaining.

　　29.Why can alcohol reach the brain ?

　　A. Because it can move through water molecules in the blood.

　　B. Because it is small enough to get through any narrow space.

　　C. Because it is so light that the bloodstream can transport .

　　D. Because it is absorbed only by the cells in the stomach.

　　30. What’s the main idea of Paragraph 3 ?

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