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All over the world men and
women and boys and girls enjoy sports. Sports help people to live happily as
well as keep fit. Today I’d like to say something about one of the most popular
sports--jogging. The National Adult Physical Fitness Survey showed that 6.5
million adult Americans jog for exercise. The popularity of jogging has been
heightened by medical claims of the benefits derived from regular participation
in this activity. Regular jogging is credited with promoting a "training effect"
that conditions the heart to do more work with less effort; increases the
efficiency of the respiratory system by strengthening the muscles that assist
breathing; increases blood volume in the body, thereby increasing the oxygen
-carrying capacity of the circulatory system; promotes blood vessel flexibility;
aids the digestive system; and helps to maintain proper body weight through the
high calorie expenditure, It is re
A. Strengthen the breathing muscles.
B. Condition the heart.
C. Build strong shoulder muscles.
D. Promote a "training effect".
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All over the world, forests are safeguarding the health of the planet itself. They do this (26) protecting the soil, providing water and (27) the climate. Trees (28) soil to mountainsides. Hills (29) the trees have been felled lose 500 times as (30) soil a year as those with trees.
Trees catch and (31) rainwater. Their leaves break the impact (32) the rains, robbing them of (32) destructive power. The roots of trees allow the water to go into the soil, (34) gradually releases it to flow down rivers and refill ground-water reserves. Where there are no (35) , the rains run in sheets of water off the land, (36) the soil with there Land (37) with trees and other plants (38) 20 times more rainwater than (39) earth. As they grow, trees absorb carbon dioxide,
A. store
B. transmit
C. attract
D. provide
