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  3. (46) Yet, after wrapping a flexible cuff around your arm and pumping it up, your doctor frowns and gives you the bad news:you ar

(46) Yet, after wrapping a flexible cuff around your arm and pumping it up, your doctor frowns and gives you the bad news:you ar

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问题     (46) Yet, after wrapping a flexible cuff around your arm and pumping it up, your doctor frowns and gives you the bad news:you are one of the roughly 60 million Americans who have high blood pressure. Because it can lurk in the body without your knowing it, high blood pressure has been called the silent killler. (47) (48) Depending on how high your pressure is, how you live and what changes you’re willing to make in your lifestyle, treatment can be tailored specifically to you. (49) The first, or top, number is the systolic reading, the pressure of blood against artery walls when the heart beats—the period of highest tension. The second, or bottom, number is the diastolic—the minimum pressure, between beats, when the heart is filling with blood and artery walls are relaxed. If the diastolic goes over 105 and stays there through several readings, that’s the beginning of the danger zone, moderate hypertension, and continued monitoring is essential. Once the diastolic rises above 115, the condition is severe. A diastolic between 90 and 104 falls into the gray area of "mild" hypertension. (50)
A. These drugs can lower blood pressure by getting rid of excess fluid and salt in the body.
B. It is the leading cause of strokes and a major factor in heart attacks and kidney failure.
C. You’ve had no symptoms, no pain, no sense of being sick.
D. For the average adult, a healthy blood-pressure reading is 120 over 80, or lower.
E. Three-fourths of those with high blood pressure are in this category.
F. The good news is that thanks to an explosion of research, science now knows how to defuse the danger, and control the disease.
选项
答案B
解析 选项B所在段落的大意是“高血压能潜伏在人体内而不为人所知，所以它被称作无声的杀手。它是中风的主要原因，是引起心脏病发作的肾功能衰竭的主要因素。”
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