The weather is getting hotter．You are thirsty playing basketball or riding home from school．A cold drink may be just the thing．But be careful what you are drinking．Something that looks cool may not be god for your health．

There are plenty of"energy drinks"on the market．Most of them have beautiful colors and cool names．The lists on them tell you they are helpful to your health．Sounds great!But after a careful check you may find that most energy drinks have lots of caffeine（咖啡因）in them．These drinks are especially aimed at young people，students，busy people and sports players．Makes sometimes say their drinks make you better at sports and can keep you awake．But be careful not to drink too much．

Caffeine makes your heart beat fast，Because of this，the International Olympic Committee has limited its use．Caffeine in most energy drinks is at least as strong as that in a cup of coffee or tea．Possible health dangers have something to do with energy drinks．Just one box of energy drink can make you nervous，have difficulty sleeping and can even cause heart problems．Scientists say that teenagers should be discouraged from taking drinks with a lot of caffeine in them．

46．The"energy drinks"are aimed at 　　．

A．	busy people and sports players
B．	students，busy people，young people and sports players
C．	old people，young people and students
D．	actors，singers，students and busy people

47．Why does the International Olympic Committee limit caffeine's use？ 　　

A．	Because most energy drinks have lots of caffeine in them．
B．	Because caffeine is helpful to people's health．
C．	Because caffeine makes your heart beat fast．
D．	Because scientists say that people should be discouraged from taking caffeine．

48．People can't drink too much energy drinks because they may cause 　　．

A．	heart problems
B．	nervousness
C．	sleeping trouble
D．	A．B and C

49．From the passage we can know that 　　．

A．	advertisements are important in getting people to buy energy drinks
B．	energy drinks are helpful to teenagers' study
C．	sports players need to drink a lot of energy drinks
D．	energy drinks are especially aimed at teenagers

50．Which of the following can be the best title of the passage？ 　　

A．	What's the Use of Energy Drinks？
B．	Who Can Drink Energy Drinks？
C．	What's That in Energy Drinks？
D．	Why Can't We Buy Energy Drinks？