新视野完型2A.doc

“The average woman takes in only two thirds of the recommended daily _1_ for iron,” notes another expert. “For a woman who already has a poor iron _2_ , any additional iron loss from exercise may be enough to tip her over the edge into a more serious deficiency,” notes the expert. Exercise can _3_iron loss through _4_mechanisms. Some iron is lost in sweat, and, for unknown reasons, intense endurance exercise is sometimes _5_ with bleeding of the digestive system. Athletes in high-impact sports such as running may also lose iron through a phenomenon where small blood vessels in the feet leak blood.There are three stages of iron deficiency. The first and most common is having low iron _6_, a condition that _7_has no symptoms. Fatigue and poor performance may begin to appear in the second stage of deficiency, when not enough iron is present to form the molecules of blood protein that _8_oxygen to the working muscles. In the third and final stage, people often feel weak, tired, and _9_ - and exercise performance is severely _10_ .1.A)permissionB)marginC)allowanceD)admission2.A)statusB)statueC)studioD)state3.A)result inB)result fromC)come inD)come from4.A)a lot ofB)a variety ofC)plenty of D)a series of 5.A)connectedB)linkedC)attachedD)associated6.A)storagesB)reservesC)percentagesD)amounts7.A)onlyB)convenientlyC)conventionallyD)typically8.A)sendB)transportC)deliverD)transmit9.A)short of breathB)Lack of breathC)out of breathD)in one breath10.A)compromisedB)composedC)compoundD)complicated (3-2A-1) However, most people with low iron reserves dont know they have a 1 , because traditional methods of calculating the amount of iron in blood (by checking levels of the blood protein that 2 oxygen) are not 3 , Beard states. 4 , its important to check levels of a different compound, which 5 the amount of storage of iron in the blood. While active, child-bearing age women are most 6 to have low iron stores, he notes, “Men are not safe, especially if they dont eat meat and have a high level of 7 activity.” (An 8 15 percent of male long distance runners have low iron stores.) Beard and other experts say its 9 for people in these groups to have a 10 blood test to check blood iron reserves.1. A). defect B). deficiency C). defence D). deficit 2. A). translate B). transport C). transmit D). transform3.A). abundant B). congest C). sufficient D). efficient4.A). Instead B). Otherwise C). Therefore D). In addition5.A) implies B). induces C). includes D). indicates6.A). possibly B). likely C). probably D). lively7.A).body B). brain C). physical D). mental8 A).valued B). estimated C). guessed D). evaluated9.A) advisable B). proper C). suitable D). appropriate10A) annual B). annually C). year D). yearly （3-2A-2）Human studies have _1_ primarily on older adults and suggest that _2_esercise can improve the speed with which the brain _3_ information. Measurements made by Arthur Kramer at the university of Illionis demonstrated that inactive adults, aged 63 to 82, could hit buttons faster in _4_ to a tone after they _5_ a 10-week water exercise course. A corresponding control group that didnt exercise showed no improvement.The boost in reaction time after exercise training may _6_ because declines associated with getting old could actually _7_declines in physical condition. Some scientists _8_the reduction in mental function often _9_ getting old may really be a penalty of neglecting to stay physically active, _10_ related factors such as medicines and poor diet.1.A)centralizedB)focusedC)centeredD)condensed2.A)frequentB)constantC)oftenD)regular3.A)processesB)possessesC)analysisD)separates4.A)answerB)replyC)reactionD)response5.A)went alongB)went afterC)went throughD)went by6.A)happenB)occurC)take placeD)appear7.A)s