共用题干The Caffeine HabitThere are more than

共用题干

The Caffeine Habit

There are more than 170 million drug addicts in the U.S.,and the strange thing is that you can be
counted as one of them.You consume your drug of choice every day;you’d feel ill if you couldri’t have it;
you’d have a hard time quitting it.
_______________(46)And if you think you get it only in coffee,tea,coca cola,or in smaller bite of choco-
[ate,you haven’tbeen paying attention.Food manufacturers recognize a hot market when they see it,and
with anywhere from 55%to 90%of the U.S.population consuming caffeine every day. _______________(47)The
popular Red Bull energy drink is one of them,and others like caffeine-infused gum,mints,beer,candy,even
soap一which is supposed to provide its caffeine boost through the skin.
Regular amount of caffeine has been the subject of endless medical studies.We know caffeine could
work effectively by controlling neurotransmitters that would normally make you sleepy,improving cognitive
Function and even athletic performance.________________(48)"Exactly what level of caffeine is harmful is not
clearly established,but generally more than five cups of coffee is too much,"said physiologist Harris Lieber-
man from U.S.Army Research Institute of Environmental Medicine,who has been studying the effects of
caffeine for more than 20 years."It’s typically possible to die from a caffeine overuse,but,"says Dr. Eric
Lavonas, a North Carolina emergency-room doctor,"you have to really work at it." _______________(49)Bill
Bradley,in 2000 presidential candidate,attributed his irregular heartbeat to caffeine overuse.
In a country of caffeine addicts,it’s unlikely that you’ll never develop a serious problem,and there
aren’t any repair centers for coffee dependence._______________（50)The highest caffeine boost can be felt one
hour following input,but significant effects can last for eight hours.If you’re at risk for heart disease or
digestive disorders,talk to your doctor about how much caffeine you should be drinking. Like any pleasurable
substance,caffeine can be abused.So enjoy一but with care.

_________（49） A:Depending on the study,the stuff now is turning up everywhere. B:The chemical that has you addicted,of course,is caffeine. C:But how much is too much? D:Far more common are people who simply fall ill from eating or drinking too much of that stuff. E:Here are seven tips to loosen the death grip of caffeine addiction. F: So the best advice is to know your limits.