急求英语小报一张（8开）

exercise protects your brain and memory

for many years, experts have advised people to exercise their brains to combat the memory loss associated with alzheimer's disease and other disorders leading to cognitive decline. for example, they suggest computer games, playing cards or chess, doing cross-word puzzles, and simply maintaining active social interactions. and such brain exercises do seem to result in modest benefits.

a number of small observational studies had suggested that physical activity can also help maintain memory and reduce the risk of cognitive decline. reports in 2006 on two large prospective studies supported the benefits of exercise on cognitive function. participants were 65 years of age or older and free of cognitive impairment on entry into these studies, and they were followed for an average of about 6 years. one study of 1,740 men and women from seattle found that the risk of dementia was 38 percent lower in those who exercised 3 or more times a week compared to those who exercised fewer than 3 times a week. the authors concluded that their results “suggest that regular exercise is associated with a delay in onset of dementia and alzheimer disease.” 

a second study of 3,375 men and women found that participants who were in the group with the highest expenditure of physical activity had a 50 percent lower likelihood of developing dementia than those with the lowest level of physical activity.

similarly, an article in a recent journal of the american medical association described the results of a randomized trial of aerobic exercise in 138 australian subjects older than age 50. on their entry, the participants did not have objective evidence of dementia. when assessed after 18 months for signs of alzheimer disease and cognitive decline, subjects who had been assigned to the exercise group showed a modest improvement in cognition compared to non-exercisers.

none of these or other studies have shown that physical exercise has a truly dramatic effect on preservation of mental function. nonetheless, the results suggest that healthier aging and prevention or delay in the development of dementia may be added to the many other benefits of regular exercise.

pollution 

pollution is the introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the physical systems or living organisms.[1] pollution can take the form of chemical substances, or energy, such as noise, heat, or light energy. pollutants, the elements of pollution, can be foreign substances or energies, or naturally occurring; when naturally occurring, they are considered contaminants when they exceed natural levels. pollution is often classed as point source or nonpoint source pollution.

travel
take an early morning flight over the still, quiet serenity of the beautiful camden valley in sydney's south west. this is the sheep country where john macarthur pioneered australia's wool industry. from the air you can take in spectacular views of the blue mountains to the west and to the east, watch the sun rise over sydney's magnificent skyline. back on the ground, enjoy the complimentary champagne breakfast. what better way to start the day. booking is essential.

funny joke

a good boy 

little robert asked his mother for two cents. "what did you do with the money i gave you yesterday?" 
"i gave it to a poor old woman," he answered. 
"you're a good boy," said the mother proudly. "here are two cents more. but why are you so interested in the old woman?" 
"she is the one who sells the candy." 

he won 

tommy: how is your little brother, johnny? johnny: he is ill in bed. he hurt himself. 
tommy: that's too bad. how did that happen? 
johnny: we played who could lean furthest out of the window, and he won.