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听力原文：Smaller class sizes in early grades translated into students scoring higher on math tests in later grades in Tennessee's experiment to see if smaller classes improved education, a study said of Friday.
The result of the experiment suggests that whether smaller classes can improve education is not clear.
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听力原文： Everybody loves the swimming pool. But how clean is the water in the average backyard or public pool？ If you trust chlorine to take care of germs, you're in for a surprise.
Chlorine and other disinfectants do indeed help to clean the water, but some germs can survive in even the best-kept pool. For example, cryptosporidium may live in pool water for several days. Crypto causes a diarrhea illness and may rinse off the bodies of infected people or diapered children into the pool. If you swallow infected pool water, you may become sick.
Other germs may live for a few minutes or a few hours in a chlorinated pool: Giardia, Shigella, and E. Coli may cause diarrhea illnesses. Pseudomonas Aeruginosa may cause an ear infection called swimmer's ear and also a skin infection called "hot tub rash", that is usually associated with very warm pools and spas.
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Most of the migratory birds no longer fly across Afghanistan to Pakistan and India because
听力原文：A man is in his best shape in the decade before age 25 when his muscles are firmest, his resistance to colds and infections is highest and his body is most efficient in utilizing nutrients. For reasons that scientists do not understand, women get a five-year bonus.
Scientists do not understand why women should outlive men by five years.
听力原文：No state epitomizes the American South better than Mississippi: First-time visitors are often struck by how friendly residents are -- the "southern hospitality" for which this part of the country is famous. They're also likely to be amazed (and far less pleased) at the year-round heat and humidity.
Mississippi is a typical American southern state.
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