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我国的股票发行实行______。
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The clean-energy business is turning into the next big investment boom, in which risks are lightly ignored. Until recently, recalls Charlie Gay, a 30-year veteran of the solar-power business, venture capitalists were far too busy catering to captains of the information-technology industry to waste time on "hippy-dippy tree-huggers" like himself. But now the tree-huggers are in the ascendant and theIT barons are busy investing in clean-energy technology. Investors are falling over themselves to finance start-ups in clean technology, especially in energy. Venture Business Research reckons that investment in the field by venture capitalists and private-equity firms has quadrupled in the past two years, from some $500m in 2004 to almost $2 billion so far this year. The share of venture capital going into clean energy is rising rapidly. Clean-energy fever is being fuelled by three things: high oil prices, fears over energy security and a growing concern about global warming. The provision of energy, the industry"s cheerleaders say, will change radically over the coming decades. Polluting coal- and gas-fired power stations will give way to cleaner alternatives such as solar and wind; fuels derived from plants and waste will replace petrol and diesel; and small, local forms of electricity generation will replace big power stations feeding far-flung grids. Eventually, it is hoped, fuel cells running on hydrogen will take the place of the internal combustion engine which is available everywhere. It is a bold vision, but if it happens very slowly, or only to a limited extent, boosters argue that it will still prompt tremendous growth for firms in the business. Analysts confidently predict the clean-energy business will grow by 20-30% a year for a decade. Jef-feries, an investment bank that organized a recent conference on the industry in London, asked participants how soon solar power would become competitive with old-fashioned generation technologies: in 2010, 2015 or 2020. About three-quarters of those present, one visitor happily observed, were "cheque-writers". This "megatrend", the keynote speaker advocated, "may be the biggest job- and wealth-creation opportunity of the 21st century." Such exaggeration might remind people of dotcom bubble. But clean-energy advocates insist growth is sustainable because of the likes of Mr. Schwarzenegger. The Governor is a hero in green circles because of his enthusiasm for environmental regulation. He easily won re-election partly because he seized on global warming as a concern and signed into law—America"s first wide-ranging scheme to cap greenhouse-gas emissions. It can be inferred from the last paragraph that_____.
寡头型市场也称寡头垄断市场，是同时包含垄断因素和竞争因素而更接近于完全垄断的一种市场结构。
Parents of children who happily eat what"s put in front of them might assume their kids are well nourished. But two new studies drive home the importance of varying that diet. Deficiencies of vitamin D, omega-3 fats, and other healthful compounds are common; it turns out—and consequential. Growing evidence links vitamin D deficiency not only to weak bones but al-so to impaired immunity, asthma, and diabetes among other problems. And some of the latest research finds that rates of asthma and related respiratory problems climb in kids who are short on other commonly missing essentials, including vitamins C and E and omega-3 fatty acids. A team at the Harvard School of Public Health evaluated the diet and respiratory (relating to the process of breathing) health of some 2,000 North American high school seniors and found that teens who lack of fruit, vegetables, and other healthful foods were most likely to have problems such as coughing, panting, episodes of bronchitis, and asthma. Vitamins C and E, which are abundant in fruit and dark-green vegetables, may "protect the lung from stress," says Harvard research fellow and study leader Jane Burns. Omega-3 reduces inflammation, a key feature of asthma, in which airways swell and make breathing difficult. Oily fish like salmon, mackerel, and tuna—as well as cod-liver oil—are rich in both omega-3 and vitaminD Vitamin D can also be obtained from multivitamin milk and sunshine—and many kids should be getting more of both. In another new study, researchers found that 55 percent of outwardly healthy children and teenagers they tested didn"t have enough vitamin D to grow healthy bones. Dark-skinned children were particularly likely to be short of the bone-building vitamin, according to Babette Zemel, an author of the study and director of the Nutrition and Growth Laboratory at Children"s Hospital of Philadelphia. The melanin (a natural dark brown colour in human skin, hair, and eyes) that makes their skin dark also blocks ultraviolet rays, which the body uses to make vitaminD In winter, when the sun was weakest, more than 90 percent of blacks in the study were vitamin D deficient. Researchers suggest pointing kids outside, and waiting a few minutes before putting on sun block; 10 minutes of midday summer sun provides 10,000 international units of the vitamin—more than enough for a day. Like melanin, sunblock prevents the skin from making vitamin D, so a bit of lotion-free exposure is necessary to grab the benefit. The study on the relationship between diet and respiratory health is to verify that teens _____.
甲公司是从事石油化工及投资的大型企业。甲公司下属子公司乙公司于2007年在中国香港地区成功发行股票并上市。2010年9月乙公司购入总部位于英国的丙公司4.2%的股份。 经过与丙公司的接触，乙公司认为，全面收购丙公司符合其长远发展目标。丙公司在尼日利亚的全资子公司是其营业收入和净利润的主要来源，经营石油开采、管道运输、加工、销售等石油化工相关的业务，拥有的油气储量占尼日利亚已探明油气储量的1/5。丙公司于2009年年初在伊拉克以15亿英镑的价格购买了新的油田，目前正在进行深入勘探。对于丙公司购买的伊拉克油田，很多股东对该油田储量的预测并不乐观，导致丙公司的股票价格自2009年开始一直低于每股15英镑。 2011年4月7日，乙公司认为收购丙公司的时机已经成熟，因而向丙公司的股东发出收购要约，拟以每股18英镑的价格收购丙公司其他股东持有的全部股份，该收购价格比报价前20个交易日丙公司股票的平均收盘价格高出25%。在乙公司发布要约收购丙公司消息的当天，丙公司股票价格大幅上涨，报收于每股19英镑。并且，英国政府相关监管部门表示，将密切关注乙公司收购丙公司事宜。 要求： 简要分析乙公司收购丙公司应当特别考虑的当前经济环境因素。
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