eine is also a powerful drug which greatly affects the body. 3. In healthy, rested people, a dose of 100 milligrams (about one cup of coffee) increases alertness, banishes drowsiness, quickens reaction time, it enhances intellectual and muscular effort, and increases heart and respiratory rates. 4. Drinking one to two cups of coffee an hour before exercise encourages the body to preserve glycogen and burn fat -----something that results in greater endurance. 5. In addition, caffeine masks fatigue. 6. In doses above 300 milligrams, caffeine can produce sleeplessness, nervousness, irritability, headaches, heart palpitations, and muscle twitches. 7. Caffeine is also habit-forming, and those who try to suddenly stop after heavy use may experience such withdrawal symptoms as headaches, lethargy, irritability, and difficulty in concentrating.The main idea of this passage is that caffeine
Though fun to watch, chimpanzees should not be kept as pets. 2. They are dangerously stronger that any NFL lineman. 3. Adult chimps weigh only 100 to 160 pounds, but have been measured pulling six to nine times their own weight-----with one hand. 4. Thus, to match the strength of an average chimp, a human being would have to be able to register a two-handed pull of about a ton it takes a very strong man to pull a quarter of that. 5. Combined with this strength is the fact that a chimp is capable of losing its temper -----for reasons known only to the chimp. 6. Chimps signal their feelings with subtle cues of behavior that aren't apparent to most humans. 7. It is quite possible for a chimp to be on the verge of violence while its owner sits unaware or even unknowingly continuous to provoke. 8. Furthermore, it's not wise to keep a cute young chimp and release it into the wild when it becomes dangerous. 9. Wild-raised chimps will routinely gang up on and kill those raised in captivity. The main idea of this passage is that
Human beings have always polluted their environment, but in the past it was easier for them to move on and live somewhere else. 2.They knew that given time, the environment would take care of pollution they left behind and they relied on the "out of sight, out of mind" philosophy. 3. Today, an increasing human population, which uses an increasing amount of energy sources, no longer has the luxury to ignore pollution. 4. The human population is approximately 7 billion. 5. Our overall energy consumption has gone up by a hundredfold from 2,000 per/person/day to 230,000 per/person/day in modern industrial nations like the United States. 6. This high energy consumption allows us to mass produce many useful and economically affordable organic products that pollute the atmosphere and groundwater damage forests and lakes causing global warming, and even deplete the ozone layer. (Borrowed from a biology textbook) The main idea of this passage is that
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