D．a diet serving as medicine

　　4．Many women take it for granted，according to passage that________.

　　A．a balanced diet can result in being fat

　　B．staying thin and healthy are both possible

　　C．lack of variety in diets leads to staying thin

　　D．vitamins are some kind of substitution for food

　　5．By“if the fuel isn’t there，the spark is useless”，the author means________.

　　A．carbohydrates，protein and fat are enough to support a human life

　　B．vitamins and minerals are virtually of no value

　　C．carbohydrates，protein and fat are as important as vitamins and minerals

　　D．without carbohydrates，protein and fat，vitamins and minerals are of no use

　　B

　　(2017·长沙高三模拟)Many people say they can not start their day without first having a cup of coffee or tea.People say these drinks help them think clearly and feel more awake.This is because of caffeine，a kind of matter found in some plants.Caffeine helps to give a jumpstart to the nervous system.Now a new report says it may also improve long－term memory.

　　Michael Yassa is a neurobiology professor at the University of California.He and other researchers wanted to know if caffeine could improve what they called memory consolidation.They asked a group of individuals to learn something new，then the same people were given caffeine，the active component in coffee，tea and chocolate.

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