2. 外语
  3. Cardiovascular diseases, which involve the heart and blood vessels, are the leading cause of death in many developed nations. At

Cardiovascular diseases, which involve the heart and blood vessels, are the leading cause of death in many developed nations. At

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问题 Cardiovascular diseases, which involve the heart and blood vessels, are the leading cause of death in many developed nations. Atherosclerosis, a chronic cardiovascular disease, involves the gradual buildup of growths called plaques on the inner smooth muscle wall of blood vessels. As atherosclerosis progresses, the risk of heart attack or stroke increases because a blood clot is more likely to become trapped in an artery that has been narrowed by plaques. Hypertension—high blood pressure—also increases the risk of heart attack or stroke. Sometimes called the silent killer, it may cause no symptoms until a heart attack or stroke occurs. Fortunately, hypertension is simple to diagnose and can usually be treated by medication, diet, exercise, or a combination of these.
What is atherosclerosis?
选项 A、A disease of the heart and blood vessels
B、Smooth muscle inside blood vessels
C、The inability of blood to clot
D、High blood pressure
答案A
解析 Atherosclerosis is a disease of the heart and blood vessels. Commas and appositives provide clues: Cardiovascular diseases, which involve the heart and blood vessels...; Atherosclerosis, a chronic cardiovascular disease....
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