【答案解析】我们常常会问自己，我们为何会在这里?生命是如何开始的?我们是不是宇宙中的独行侠呢？我们往往从宗教、审美观、精神世界、价值观等角度来讨论这最基本的问题。而我认为，科学为这问题提供最佳答案。一般来说，科学家有责任向大家提供信息，有责任了解大众的要求，有责任解答大众想了解的有关大自然的问题。 [解析]
We often ask ourselves why we are here, how life started, and if we are alone in the universe. Those fundamental questions are often addressed by religion and by our sense of aesthetics, by spiritual feelings, feelings of values. But I think science can contribute to the best answers to those questions. In general, scientists are responsible to inform the public, to find out what they want, and to answer the questions that the public wants to know about the nature.

【答案解析】健康食品因人们开始重视自身健康而备受青睐，“健康食品”这种说法本身就具有一种讽刺意味，因为言下之意还有“非健康食品”。健康食品包括那些尽可能不予以加工的天然食品，也就是说这食品不含延长食物保鲜期的防腐剂，不含用以改善食物味道或美化食物的化学成分。热衷于健康食品的人士大多属于素食者，他们不吃肉类食物，喜从豆类、奶酪和鸡蛋等食物中获取人体所需的蛋白质。 [解析]
Health food gained popularity when people began to think more seriously about their physical well-being. The well term "health food" is ironic because it implies that there"s also "unhealthy" food. Health food includes natural food with minimal processing, i. e. , there are no preservatives to help it last longer or other chemicals to make it taste or look better. Most health food enthusiasts are vegetarians: They eat no meat; they prefer to get their essential proteins from other sources, such as beans, cheese and eggs.