【简答题】Experiments have proved that children can be instructed in swimming at a very early __1___. At a special swimming pool in Los Angeles, children become ___2__ at holding their breath under water even b...
【单选题】(p. 58) As a teenager, Louis spent his summers as a lifeguard. When he and his children went to swim at a public swimming pool, he noticed its lifeguards seemed to spend all of their time flirting wit...