Questions are based on the following passage． Eating fruits and vegetables has proved helpful in preventing various chronic （ 慢性的 ） illnesses．Does that mean the more the better? The data from 16 studies were analyzed，（36）more than 833，234 adults．The span of the studies（37）from 5 to 26 years．56，423 adults participating in the studies died．Overall， the more fruits andvegetables people（38）， the less likely they were to have died during the study period．For every（39）serving eaten， up to four a day， the chance of dying for any reason decreased by 5 percent．Those who ate four servings a day were 24 percent less（40）to have died than those who ate none atall．However， eating five or more daily servings indicated no added（41） Higher consumption offruits and vegetables also showed（42）no effect on the probability of dying from cancer． Although the recommendation of the（43）serving varies with age， health status and other factors， most adults are called for to fill half their plate with fruits and vegetables．The food pyramidmodel（44）that adults eat three to five servings of vegetables and two to four servings offruits dally． However， the study did not determine whether certain fruits or vegetables were more or lessbeneficial than others．It indeed inferred that there's a（n）（45）to how much fruit and vegetables aregood for you．