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Researches show that more than three cups of coffee a day can cause unpleasant symptoms
such as nervousness, irritability and insomnia. Thus, although many people build up a certain
tolerance for the stimulant, experiments indicate that caffeine users take longer to fall asleep
than non-users and they also wake up more often. The effects of caffeine are similar in persons
of all ages, but certain groups are particularly sensitive to the drug, including the elderly
children, pregnant women, and those suffering from heart disease, hypertension, and emotional
illness.
19. One can understand from the passage that...
A) children are particularly sensitive to some drugs
B) the effects of caffeine are deadly for all age groups
C) coffee drinkers must sleep less
D) most people can tolerate a moderate amount of coffee a day
20. It is explained in the passage that...
A) over a certain amount of caffeine has a harmful effect on our health
B) the elderly are more sensitive to caffeine than any other age group
C) caffeine is good for a sound sleep
D) heart patients can tolerate fairly large amounts of caffeine
21. The author stresses.....
A) how useful coffee is in our everyday life
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