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改写为倒装句。

6. The children should on no account go on their own.

on their own.

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   A Canadian study suggests that current sodium (钠) intake levels are relatively safe for most Americans and that reducing them to the very low levels recommended by federal health officials and leading medical groups may harm a significant number.

   The current average sodium consumption in the United States is about 3,400 milligrams (there are 1,000 milligrams in one gram) per day. This is about the amount of sodium in about 1. 5 teaspoons of salt. Dietary guidelines offered by the federal government and leading medical groups recommend reducing the average to 2,300 milligrams for the general population and 1,500 for groups considered at greater risk,like adults older than 50,African-Americans,and people with high blood pressure,among others.

   However,previous studies have found little evidence to support those low recommended sodium targets. There is considerable evidence that lowering sodium can reduce blood pressure,but there is scant evidence that reducing sodium consumption will necessarily reduce the risk of heart attacks, strokes(中 风) and death.

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7. The underlined word “scant” in Paragraph 3 is closest in meaning to “”.

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   B. may help prevent heart disease

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   A. He is doubtful about them.

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