【单选题】Among all cancers, lung cancer is the biggest killer: more than 100,000 Americans die of the disease each year. Giving up smoking is one way to reduce the risk, but another answer may lie in the kitch...
【简答题】age boys, regardless of race, are more likely to die from gunshot wounds than from all natural causes combined. By the time the average American child leaves primary school, he or she will witness...