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1. Humans not only love eating ice cream, they enjoy feeding it to their pets(宠物). Market studies show that two thirds of all dog owners give ice cream ot their dogs. Unfortunately, says William Tyznik, an expert on animal nutrition(营养)at Ohio State University, ice cream is not good for dogs. "It has milk sugar in it, "he says," which dogs cannot digest very well." 2. Bothered by that knowledge but aware of the desire of dog owners to please their companions, Tyznik invented a new frozen treat for dogs that, he says, is more nutritious than ice cream--and as much fun to eat. The product, called Frosty Paws, is made of a liquid by-product(副产品)of cheese and milk with the sugar removed. Frosty Paws also contains refined soy flour, water, vegetable oil, vitamins and minerals. It took Tyznik, who has also invented a horse feed (called Tizwhiz) and another dog food (named Tizbits), three years to perfect the Frosty Paws formulas, and two attempts to commercialise it. After losing ＄ 25,000 trying to market the invention himself, Tyznik sold the rights to Associated Ice Cream of Westerville, Ohio, which makes the product and packages it in cups. 3. Tyznik claims that Frosty Paws has been tested extensively and that "dogs love it". Of 1,400 dogs that have been offered the product, he says, 89 percent took it on the first try. Three out of four preferred it to Milk-Bone or sausages. The product, which will be available in the ice-cream section of supermarkets, comes in packs of three or four cups, costing between ＄ 1.79. 4. What would happen if a human should mistake Frosty Paws for real ice cream Nothing, says Tyznik. It’s harmless, but frankly, he says, it won’t taste very good. Para 1 ______.
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实际工作中，企业每天要发生的很多复杂的经济业务，因此不会引起会计要素的变动，也不会破坏会计等式的平衡。 ( )
某建设项目的行业标准投资回收期丁为5年，该项目通常投资额为1100万元，年生产成本为 1150万元。为此该项目拟定了A、B、C三个设计方案，有关情况见表3-5。 表3-5 资料数据表 单位：万元 A B C 投资额 1000 1100 1400 生产成本 1200 1150 1050 质量水平 一般 一般 高于一般 年纯收入 一般 一般 高于一般 技术水平 中等 中等偏上 先进 经专家组商定的经济评价指标体系、指标权重、指标分等及其标准分列于表3-6。 表3-6 多因素评分优选法评分表 评价指标 权重 指标分等 标准分 方案与评分 A B C 投资额 0.25 1．低于一般水平 2．一般水平 3．高于一般水平 90 70 60 年生产成本 0.25 1．低于一般水平 2．一般水平 3．高于一般水平 90 70 60 质量水平 0.20 1．一般水平 2．高于一般水平 70 80 年纯收入 0.20 1．一般水平 2．高于一般水平 70 80 技术水平 0.10 1．中等水平 2．中等偏上 3．先进水平 60 70 90 【问题】
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"I have great confidence that by the end of the decade we’ll know in vast detail how cancer cells arise," says microbiologist Robert Weinberg, an expert on cancer, "But," he cautions, "some people have the idea that once one understands the causes, the cure will rapidly follow. Consider Pasteur. He discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available." This year, 50 percent of the 910 000 people who suffer from cancer will survive at least five years. In the year 2000, the National Cancer Institute estimates, that figure will be 75 percent. For some skin cancers, the five-year survival rate is as high as 90 percent. But other survival statistic(统计)rate still discouraging-13 percent for lung cancer, and 2 percent for cancer of the pancreas(胰腺). With as many as 120 varieties in existence, discovering how cancer works is not easy. The researchers made great progress in the early 1970s, when they discovered that oncogenes, which are cancer-causing genes(基因), are inactive in normal ceils. Anything from cosmic rays to radiation to diet may activate a dormant oncogene, but how remains unknown. If several oncogenes are driven into action, the cell, unable to turn them off, becomes cancerous. The exact mechanisms involved are still mysterious, but the likelihood that many cancers are initiated at the level of genes suggest that we will never prevent all cancers. "Changes are a normal part of the evolutionary process," says oneologist William Hayward. Environmental factors can never be totally eliminated; as Hayward points out, "We can’t prepare a medicine against cosmic rays." The prospects for cure, though still distant, are brighter. "First, we need to understand how the normal cell controls itself. Second, we have to determine whether there are a limited number of genes in cells, which are always responsible for at least part of the trouble. If we can understand how cancer works, we can counteract its action.\ According to Robert Weinberg, which of the following is true
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