单选题
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。
{{B}}第一篇{{/B}}
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 per day.
"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
【正确答案】 D
【答案解析】[解析] 该题为细节题。文中第一段提到“美国人的食盐量比推荐食用量的两倍还要多,这增加了他们患高血压、心脏病和中风等疾病的风险提高”,故选D。
单选题 The recommended sodium intake for most U.S. adults is
【正确答案】 C
【答案解析】[解析] 从题目可知此题是关于钠的摄入量,故可以定位至第五段“结果显示三分之二的成年人的日食钠量均不应超过1,500毫克,”,因此可知1,500毫克是一个推荐的钠摄入量,故选C。
【正确答案】
【答案解析】
单选题 Nearly 70 percent of U.S. adults are in high-risk groups,
【正确答案】 D
【答案解析】[解析] 第五段提到“因为他们是黑人或者是年龄超过了四十岁的人——是高危人群”,故选D。
单选题 Packaged, processed and restaurant foods tend to be
【正确答案】 D
【答案解析】[解析] 第八段提到“大部分的钠摄入量都源于包装食品,加工过的食品和饭店里的食品”,后面又说要减少食品供给中的钠的含量。因此可以得知这些食品中的含盐量比较高,故选D。