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  Increasing fluid intake(摄入量)by about a liter per day appears to have no negative effects on healthy older men.Dutch researchers report.

  Dr.Mark G.Spigt of Maastricht University and his colleagues note that older people are often dehydrated(脱水),partly because their sensation of thirst may be slow.On the other hand, the elderly can easily become overly hydrated, because their kidneys(肾)tend to work less efficiently.Keeping extra water reduce the level of sodium(钠)in the body, which can have serious consequences.

  To investigate the general effects of increased fluid intake, the researchers examined data from a study involving 141 healthy men aged between 55 and 75.In random(随意的)order they were either advised to increase their water intake by a liter and a half per day, or were given a spoonful of syrup(糖浆)per day.

  After 6 months, the men urged to drink more water had managed to boost their daily fluid intake by an average of about a liter per day.There were no significant differences between the two groups in blood pressure or sodium level.

  The researchers thus concluded that the advice to increase fluid intake had no negative effects.

  Summing up, Spigt added,“It seems unreasonable to worry about the harmful effects of drinking extra water, he warned,”This does not mean that one can drink too much.Extreme intakes of water-more than 10 liters–can be harmful.

(1)

The first paragraph is written to ________.

[  ]

A.

attract readers’ attention

B.

introduce some researchers to us

C.

introduce the topic of the passage

D.

tell us the result of a research

(2)

According to Spigt and his colleagues, the elderly are often dehydrated ________.

[  ]

A.

because their kidneys can’t work properly

B.

because water can reduce the level of sodium in the body.

C.

because they need less water than before.

D.

partly because their feeling of thirst may be slow.

(3)

Which of the following can explain the underlined word“boost”(in Paragraph 4)?

[  ]

A.

Increase

B.

Reduce

C.

Complete

D.

Require

(4)

The main purpose of this passage is to tell people ________.

[  ]

A.

elderly men like to drink more water

B.

elderly men should drink more water

C.

drinking extra water does no harm to elderly men

D.

drinking too much water does harm to people

答案:1.C;2.D;3.A;4.C;
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