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下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。
第一篇 U.S. Eats Too Much Salt
People in the United States consume more than twice the recommended amount of salt, raising their risk for high blood pressure, heart attacks and strokes, government health experts said on Thursday.
They found nearly 70 percent of U. S. adults are in high-risk groups that would benefit from a lower-salt diet of no more than 1,500 mg per day, yet most consume closer to 3,500 mg perday.
"It's important for people to eat less salt. People who adopt a heart-healthy eating pattern that includes a diet low in sodium (钠) and rich in potassium (钾) and calcium (钙) can improve their blood pressure," Dr. Darwin Labarthe of the Centers for Disease Control and Prevention (CDC) said in a statement.
"People need to know their recommended daily sodium limit and take action to reduce sodium intake (摄入量) ," Labarthe said.
The study in the CDC's weekly report on death and disease used national survey data to show that two out of three adults should be consuming no more than 1,500 mg of sodium per day because they are black or over the age of 40 -- which are considered high-risk groups.
Yet studies show most people in the United States eat 3,436 mg of sodium per day, according to a 2005-2006 CDC estimate.
Most of the sodium eaten comes from packaged, processed and restaurant foods. The CDC said it will join other agencies in the Health and Human Services Department in working with major food manufacturers and chain restaurants to reduce sodium levels in the food supply.
Nationwide, 16 million men and women have heart disease and 5.8 million are estimated to have had a stroke. Cutting salt consumption can reduce these risks, the CDC said.
[单选题]
Eating too much salt raises a person's risk for
A. strokes.
B. heart attacks.
C. high blood pressure.
D. all of the above.
[单选题]
The recommended sodium intake for most U.S. adults is
A. closer to 3,500 mg per day.
B. as much as 3,436 mg perday.
C. no more than 1,500 mg per day.
D. less than 3,500 mg per day.
[单选题]
A heart-healthy diet is one that contains
A. a low level of sodium.
B. a lot of potassium and calcium.
C. no salt at all.
D. both A and B.
[单选题]
Nearly 70 percent of U.S. adults are in high-risk groups,
A. for they are inactive.
B. for they consume sodium every day.
C. for they frequently eat out.
D. for they are black or over the age of 40.
[单选题]
Packaged, processed and restaurant foods tend to be
A. good in taste.
B. low in price.
C. poor in nutrition.
D.high in salt.
