16．Food and drink makers are adding caffeine to a growing number of products．Is it safe for kids to consume these products？
You may have heard adults say they can't get going in the morning without a cup of coffee．One reason why they may feel that way is that coffee contains caffeine，a substance known to improve and increase energy．Caffeine occurs naturally in coffee，tea，and cocoa beans，which are used to make chocolate．But now food makers are adding caffeine to many products，from popcorn and potato chips to water．"It's possible for all of this caffeine consumption to add up and become dangerous，"says Virginia Stallings，a doctor at the Children's Hospital of Philadelphia．
Studies show that too much caffeine can cause inability to sleep，and a racing heartbeat．What's more，caffeine is habit-forming．Those who consume it regularly and stop suddenly may experience headaches and feel tired．
One of the biggest problems is the large amount of caffeine added to so-called energy drinks，like Red Bull．A 12-ounce can of cola has about 35milligrams of caffeine．A similar serving of Red Bull contains more than triple （三倍） that amount．Emergency-room visits related to energy-drink consumption were up from 10，068visits in 2007to 20，783in 2011．
Teenagers should be aware of caffeine's effects on health and on the brain．Take，for example，teenagers who consume caffeine to stay awake and study for a test．The effect？Research shows they may remember less of what they just studied．
So，what can be done to protect young people from the harmful effects of caffeine？Michael Jacobson of the Center for Science in the Public Interest，says the FDA needs to set limits on caffeine，especially in energy drinks．The amount of caffeine should be printed on food labels to warn consumers．Doctors say kids should avoid caffeine．If you need extra energy，try these natural methods instead：eating right，exercising，and getting plenty of sleep．
32．According to the text，it's dangerous to add moreDto drinks．
33．What should the FDA do in protecting the consumers？C
A．Draw up a project about physical exercise．
B．Forbid kids from having water with caffeine．
C．Create a set of standards on caffeine products．
D．Not allow energy drinks to appear in the market．
34．What can we learn from the text？B
A．Cola has much more caffeine than Red Bull．
B．More people are suffering from energy drinks．
C．Drinking enough Red Bull can help sleep well．
D．Having too much caffeine can improve memory．
35．The text is written mainly for thoseB．
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You may have heard adults say they can't get going in the morning without a cup of coffee．One reason why they may feel that way is that coffee contains caffeine，a substance known to improve and increase energy．Caffeine occurs naturally in coffee，tea，and cocoa beans，which are used to make chocolate．But now food makers are adding caffeine to many products，from popcorn and potato chips to water．"It's possible for all of this caffeine consumption to add up and become dangerous，"says Virginia Stallings，a doctor at the Children's Hospital of Philadelphia．
Studies show that too much caffeine can cause inability to sleep，and a racing heartbeat．What's more，caffeine is habit-forming．Those who consume it regularly and stop suddenly may experience headaches and feel tired．
One of the biggest problems is the large amount of caffeine added to so-called energy drinks，like Red Bull．A 12-ounce can of cola has about 35milligrams of caffeine．A similar serving of Red Bull contains more than triple （三倍） that amount．Emergency-room visits related to energy-drink consumption were up from 10，068visits in 2007to 20，783in 2011．
Teenagers should be aware of caffeine's effects on health and on the brain．Take，for example，teenagers who consume caffeine to stay awake and study for a test．The effect？Research shows they may remember less of what they just studied．
So，what can be done to protect young people from the harmful effects of caffeine？Michael Jacobson of the Center for Science in the Public Interest，says the FDA needs to set limits on caffeine，especially in energy drinks．The amount of caffeine should be printed on food labels to warn consumers．Doctors say kids should avoid caffeine．If you need extra energy，try these natural methods instead：eating right，exercising，and getting plenty of sleep．
32．According to the text，it's dangerous to add moreDto drinks．
| A．tea | B．chocolate | C．yoghurt | D．caffeine |
A．Draw up a project about physical exercise．
B．Forbid kids from having water with caffeine．
C．Create a set of standards on caffeine products．
D．Not allow energy drinks to appear in the market．
34．What can we learn from the text？B
A．Cola has much more caffeine than Red Bull．
B．More people are suffering from energy drinks．
C．Drinking enough Red Bull can help sleep well．
D．Having too much caffeine can improve memory．
35．The text is written mainly for thoseB．
| A．who often have headaches | B．who are caffeine-product lovers |
| C．who usually feel tired | D．who are food and drink makers |