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听力原文： China has never hidden its desire to become a major force in the aviation and aerospace industries. The first homegrown Chinese jetliner, the medium range ARJ-21 Advanced Regional Jet for the 21st Century, should start to roll off the production line later this year. China expects to sell 300 of the 100-seater planes to Chinese customers over the next 20 years. There are 71 firm orders from smaller domestic carriers, and China intends to target export markets in Asia, Africa and South America.
China is the world's second largest market for planes outside the US. Sales are booming as the country's airlines race to meet the surged demand for domestic air travel. According to a leading London consultancy, Boeing currently leads the way in China with a 64% market share. But Airbus is closing the gap. Both companies have invested heavily there, manufacturing parts in the country transferring technical know-how.
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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.
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.
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