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Replacing salt with a common substitute (Alto) could prevent thousands of strokes and heart attacks in Britain each year, a study suggests. Salt substitutes containing less sodium（钠）and added potassium are already available in supermarkets and taste like normal salt. They had been linked to lower blood pressure but the new research is the first to show a clear link with reduced rates of heart attacks and strokes.
The study, published in the New England Journal of Medicine, suggests that the risk of stroke was cut by as much as 14 per cent in adults with a history of high blood pressure.
Strokes cause about 34, 000 deaths in the UK each year and arc the biggest cause of severe disability. There are more than 100, 000 hospital admissions each year due to heart attacks, or about one every five minutes, according to the British Heart Foundation. This research marks one of the largest "dietary intervention（干预）" studies ever conducted.
Participants of the research in some of the villages were provided with the salt substitute, which contained 70 per cent sodium chloride (#1KE)) and 30 per cent potassium chloride, free of charge. Those in the other villages continued to use normal table salt, which is 100 percent sodium chloride. They were tracked for an average of nearly five years each, and more than 3, 000 had a stroke. For those using the salt substitute, researchers found that the stroke risk was reduced by 14 per cent.
Graham MacGregor, professor of cardiovascular medicine at Barts and the London School of Medicine, said: "This study clearly demonstrates that in the UK consumers should be encouraged not to add salt to food. If they have to, it's vital that they use a reduced sodium with added potassium sail."
As much as three quarters of the sodium in the average British diet is already added to processed foods. Victoria Taylor, senior dietician at the British Heart Foundation, cautioned that switching to a salt substitute while cooking at home will not help you kick the habit of salty foods," she said.
13.What does the underlined word "they" in Paragraph 1 refer to?
A.Researchers.
B.Heart attacks.
C.Salt substitutes.
D.Supermarkets.
14.What do the figures in Paragraph 3 indicate?
A.This research has attracted many subjects.
B.An increasing number of people are dying.
C.There're not enough hospitals in Britain.
D.British people are facing a big health risk.
15.What does Graham MacGregor probably agree with?
A.Salt is sure to make food taste more delicious.
B.Potassium and sodium are equally important.
C.People should avoid food that contains salt.
D.People should consume as little salt as possible.
16.What is mainly talked about in the text?
A.Salt substitutes probably save lives.
B.People favor dietary intervention.
C.Research focuses on blood pressure.
D.Salt causes many kinds of diseases.

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