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  3. If you have high blood pressure, you’re in good【C1】________Hypertension affects 67 million Americans, including nearly two-third

If you have high blood pressure, you’re in good【C1】________Hypertension affects 67 million Americans, including nearly two-third

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问题     If you have high blood pressure, you’re in good【C1】________Hypertension affects 67 million Americans, including nearly two-thirds of people over age 60. But it isn’t an inevitable part of the aging【C2】________. It’s better to think of it as【C3】________sodium poisoning. And, there’s a way to prevent the problem—and to save many, many lives.
    A lifetime of【C4】________too much sodium (mostly in the form of table salt) raises blood pressure, and high blood pressure kills and disables people by【C5】________ strokes and heart attacks. In the United States, according to best estimates,【C6】________sodium is killing between 40,000 and 90,000 people and running up to $20 billion in medical costs a year.
    Americans on average【C7】________about 3,300 milligrams of sodium per day, but experts recommend less than 2,300 milligrams—and less than 1,500 milligrams for people over age 50, black people, or those who already have hypertension, diabetes or kidney disease, which【C8】________a majority of American adults. Either【C9】________is far below where most Americans are now.
    The reason that nearly everyone eats【C10】________too much sodium is that our food is loaded with it, and often where we don’t【C11】________or expect it. Of course ham and canned soup are full of salt, but so are many foods that are【C12】________: A blueberry cake can have more than double the salt of a serving of potato chips.【C13】________healthy-sounding food can pack【C14】________ sodium loads. Many restaurant main courses have far more sodium than is recommended for an【C15】________day.
    Doctors warn people with high blood pressure to go on a low-salt diet, but that’s virtually impossible in today’s world,【C16】________nearly 80 percent of the sodium that Americans eat comes in【C17】________and restaurant food. You can’t take it out. And【C18】________everyone, not just people with hypertension【C19】________over food labels, should be taking in less sodium. The only way to prevent millions of Americans from developing high blood pressure is for companies and restaurants to stop loading up their food with sodium. It’s not easy,【C20】________it isn’t impossible either.
【C16】
选项 A、however
B、so
C、because
D、if
答案C
解析 上半句提到医生们警告高血压患者要坚持低盐饮食，但现如今，几乎不可能做到这一点。下半句表明：从美国人摄入的80％的钠来自……和餐厅食品。在外就餐无法控制食物的含盐量，可判断后半句为前半句的原因。故选C项because。A项however“但是”表转折关系，但前面已经有but。B项so“所以”，虽然表因果关系，但本句的逻辑应是结果在前，原因在后。D项if“如果”表条件，空格后的内容是现实情况，不是条件假设。
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