题目

Garlic（大蒜） is similar to other bulb-shaped plants, including onions. But garlic is special. For centuries, people have used garlic not only for cooking, but also for medicine. Researchers at the Cornell University studied the medicinal use of garlic throughout history. They found references to garlic in ancient texts from Egypt, Greece, Rome, China and India. For example, in ancient Greece and Rome, people considered garlic an aid to strength. The original Olympic athletes in Greece ate garlic to improve their performance. Workers who built the pyramids in Egypt ate garlic. But why is garlic such a healthy food? The answer is that garlic creates a gas called hydrogen sulfide(氢化硫). At first, hydrogen sulfide does not seem very healthy. In fact, it is poisonous. It smells like rotten eggs. But it does an important job in our bodies. Hydrogen sulfide relaxes blood vessels(血管). Relaxing blood vessels, in turn, allows more oxygen to travel to the body’s organs. It lowers high blood pressure and protects the body against cardiovascular disease. “Cardio” relates to the heart and “vascular” relates to blood vessels. Some researchers in China have gone so far as to call hydrogen sulfide the key to a longer life. In a 2007 study, researchers at the University of Alabama at Birmingham studied how garlic increased hydrogen sulfide and how that, in turn, affected red blood cells. David Kraus led that study. He and his team performed their study on rats. They found that when garlic compounds changed into hydrogen sulfide, the gas caused the muscles to relax.   In a 2015 experiment at Penn State University, researchers injected a solution(溶液) that would create hydrogen sulfide in the arms of healthy young adults. They wanted to see what hydrogen sulfide would do to a small area of blood vessels. 24. Which of the following is the best of the passage? A. Garlic: a Good Cooking Ingredient    B. Health Benefits of Garlic on People C. References to Garlic in Ancient Texts   D. Health Functions of Hydrogen Sulfide 25. According to the people in ancient Greece and Rome, garlic could make people become        . A. smarter       B. slimmer      C. stronger    D. crueler 26. What can we infer about hydrogen sulfide? A. It can cure high blood pressure.  B. It can improve a person’s emotions. C. It can repair damaged blood vessels. D. It can increase the flow of blood. 27. Eating Garlic can help people prevent          . A. heart disease    B. blood disease    C. skin disease   D. lung disease 答案：BCDA

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