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Coffee has been a part of people's lives for thousands of years, and today it is still one of the most popular d______ (1) in the world. Many people in the world b______ (2) their busy day by drinking a cup of coffee. They think that a cup of coffee in the morning helps them begin their day in the r______ (3)way. So they say a cup of coffee is n______ (4) for them in the morning. Do you know what is in the coffee that makes our bodies and brains active? It is caffeine. Caffeine may i______ (5) a person's mental and physical abilities. For example, two cups of coffee will make you b______ (6) faster and augment (增大) body heat. All this makes your heart b______ (7) faster, and doctors warn that this may be a little d______ (8) . Caffeine is f______ (9) in tea, coffee, chocolate and some other foods. A little caffeine is probably not h______ (10) . But too much caffeine can make people nervous and sleepless. |