根据下面材料，回答下面试题：
　　What you're always heard? We're eating too much salt. The average American gets about 3.4 grams of sodium every day, far more than the upper limit of 2.3 grams recommended by the USDA." The Institute of Medicine estimates that reducing sodium intake (摄取量) nationwide could prevent 100,000 deaths every year.
　　The headlines now? It's time to get tough. The New York City health department recently kicked off a national effort to cut the amount of salt in packaged and restaurant food by 25% over five years.80% of the salt in the average person's diet comes from those sources not from the saltshaker(盐瓶)
　　But wait! The benefits of salt reduction are surprisingly murky. At least 13 studies have tried to find out what happens to people who choose to eat salty or not-so-salty food-and the results have pointed in every direction. Some studies suggest that cutting salt protects the heart; others that intense salt reduction can actually increase heart problems. What's needed, Dr.Michael Alderman says, is a randomized ( 随机的), controlled trial, in which people are put on different diets and followed for years. It's the only way to get a reliable answer, but it's never been done.
　　So what should you do? Go easy on processed foods and eat more produce. Those changes will improve your diet in a variety of ways and cut the amount of sodium you consume. If your blood pres- sure is high, work with your doctor to control it with drugs and lifestyle changes. If your blood pres-sure is healthy? At this point, there's no convincing reason for you to count every grain.
　　第21题 It is stated in Paragraph 1 that our sodium intake__________
　　A.is within the healthy range B.is a bit over the upper limit
　　C.is far beyond what is necessary D.is well below the lower limit
　　答案：C
　　第22题 The main sources of salt in our diet are__________
　　A.home-made food and packaged food B.restaurant food and saltshakers
　　C.home-made food and saltshakers D.restaurant food and packaged food
　　答案：D
　　第23题 What does the word "murky" (Para. 3) probably mean?
　　A.Unclear. B.Significant. C.Obvious. D.Exaggerated.
　　答案：A
　　第24题 What does Dr. Michael Alderman say about a randomized, controlled trial?
　　A.It has been successfully conducted. B.It should be carried out.
　　C.It is already under way. D.It is too late to try it.
　　答案：B
　　第25题 As stated in the last paragraph, people with normal blood pressure__________
　　A.should consider a change of their lifestyle
　　B.have every reason to be careful about sodium
　　C.will not be affected by the amount of sodium taken
　　D.do not have to take sodium too seriously
　　答案：D

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