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Americans eat vegetables per person today as they did in 19i0.
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《消费者权益保护法》中的消费者是指为生活消费需要，购买、使用商品或接受服务的个人或单位。 ( )
Keeping Cut Flowers 1.While everybody enjoys fresh cut flowers around his house, few people know how to keep them for as long as possible. This may be done by keeping in mind a few simple facts.2.An important thing to remember about cut flowers is that they are sensitive to temperature. For example, studies have shown that cut carnations(康乃馨) retain their freshness eight times longer when kept at 12oC than when kept at 260c. Keeping freshly harvested flowers at the right temperatures is probably the most important aspect of flower care.3.Flowers are not intended by nature to live very long. Their biological purpose is simply to attract birds or insects, such as bees, for pollination (授粉). After that, they quickly dry up and die. The process by which flowers consume oxygen and produce carbon dioxide (二氧化碳), called respiration (呼吸), generates the energy the flower needs to give the flower its shape and colour. The making of seeds also depends on this energy. While all living things respire, flowers have a high level of respiration. A result of all this respiration is heat, and for flowers the level of heat relative to the mass of the flower is very high. Respiration also brings about the eventual death of the flower. Thus the greater the level of respiration, the sooner the flower dies.4.How, then, to control the rate at which flowers die By controlling respiration. How is respiration controlled By controlling temperature. We know that respiration produces heat, but the reverse is also true. Thus by maintaining low temperatures, respiration is reduced and the cut flower will age more slowly.5.Another vital factor in keeping cut flowers is the quality of the water in which they are placed. Flowers find it difficult to “drink” water that is dirty or otherwise polluted. Even when water looks and smells clean, it almost certainly contains harmful substances that can endanger the flowers. To rid the water of these unwanted substances, household chlorine bleach (含氯漂白剂) can be used in small quantities. It is recommended that 15 drops of chlorine bleach(at 4% solution) be added to each litre of water. The water and solution should also be replaced each day. Paragraph 4（）
2004年12月，某学校10名教师与旅行社签订旅游协议，定于2005年2月8日，组团赴新马泰港澳进行旅游活动。旅游者按规定每人预付了8000元旅游费。2月5日旅行社电话告知旅游者，由于机票无法解决，此团被迫取消。 该旅行社境外部经理到学校说明情况，赔礼道歉，退还预付旅游费。双方发生争执。旅游者投诉要求旅行社赔偿损失每人500元 。 旅游者投诉后不久，认为旅游者中有的已经买了礼品，准备出国时馈赠亲友；有的已经与境外亲友约定会面，却因旅行社单方面取消出国，使其无法与境外亲友团聚，精神上的损失难以弥补，所以要求将旅行社的赔偿金额增加到2000元。针对此情况，以下说法（）正确。
旅游者携带珠宝、钻石的，如准备携带出境，应向海关登记，由海关发给证明书，出境时海关凭证核放。 ( )
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