B. Keywords.

salt, too much, risk, cardiovascular disease, salt reduction, daily salt intake.
Vocabulary.

crucial, stroke, cardiovascular, borderline.
Listen to a passage about daily salt intake, and complete the research report.
Salt is crucial to our health, but too much of it can put human at risk from high blood pressure, heart disease and stroke.
Many reports, researchers at Harvard Medical School say the significant reduction in salt intake can cut the chances of heart disease and strokes by a quarter.
Here is our health correspondent, Adam Brimelow.
It's long been known that cutting salt can reduce blood pressure, but there has been much less evidence of what it means for cardiovascular disease including heart attacks and strokes.
The Harvard team followed up people with borderline high blood pressure, who taken part in two salt reduction studies, typically cutting intake from 10 to 7 grams a day.
The risk of developing cardiovascular disease over the next decade or so was cut by a quarter compared with those who didn't reduce their salt intake.
And their chances of dying from cardiovascular disease fell by 1/5.
In developed countries such as the United States and the UK, the average adult daily salt intake is about 10 grams, much of this is already in the food the people buy, including processed foods and bread.
Many experts say no one should have more than 3 grams.
They say the best way to cut salt is to get away from fast food, check labels and have plenty of fresh fruit and vegetable.
Adam Brimelow reporting.