练习：

　　1. Too much salt raises one's risk for

　　A high blood pressure.

　　B heart attacks.

　　C strokes,

　　D all of the above.

　　2. How much salt do most American adults eat per day?

　　A No more than 1,500 mg

　　B Closer to 3,500 mg.

　　C Less than 3,436 mg.

　　D Closer to 1,500 mg.

　　3. To improve their blood pressure, people should have a diet

　　A rich in potassium and sodium.

　　B rich in potassium and calcium.

　　C rich in calcium and sodium.

　　D none of the above.

　　4. The high-risk groups include those

　　A who are black.

　　B who are over the age of 40.

　　C who are white and young.

　　D both A and B

　　5. Packaged, processed and restaurant foods are known to be

　　A cheap.

　　B tasty.

　　C rich in salt.

　　D healthy.

　　答案与题解

　　1. D 短文的第一段说，吃盐过多会增加罹患高血压，心脏病和中风的危险。

　　2. B 短文的第二段说，大多数美国成年人的日食盐量接近300 毫克。

　　3. B 短文的第三段说，采用低钠并富含钾、钙的饮食方式将有利于改善血压。

　　4. D 短文的第五段说，黑人和年龄超过40 岁的人被视为高危人群。

　　5. C 短文的倒数第二段说，人们所食用的纳绝大部分来自于包装、加工和饭店食品。

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