单选题 Each year millions of Americans with old
单选题 When we talk about intelligence
单选题The Unfair Stigma Surrounding Millennials and Their MoneyA Millennials often get a bad rap 不公正的对待 when it comes to responsibility.Apparently，they change jobs too frequently.They put off marriage.They
单选题. Almost 150 years after photovoltaic (光电的) cells and wind turbines (涡轮机) were invented, they still generate only 7% of the world's electricity. Yet something remarkable is happening. From being secondary to the energy system just over a decade ago, they are now growing faster than any other energy source and their falling costs are making them competitive with fossil fuels. BP, an oil firm, expects renewables to account for half of the growth in global energy supply over the next 20 years. It is no longer far-fetched to think that the world is entering an era of clean, unlimited and cheap power. There is a problem, though. To get from here to there requires huge amounts of investment over the next few decades. Normally investors like putting their money into electricity because it offers reliable returns. Yet green energy has a dirty secret. The more it is used, the more it lowers the price of power from any source. That makes it hard to manage the transition to a carbon-free future, during which many generating technologies, clean and dirty, need to remain profitable if the lights are to stay on. Unless the market is fixed, subsidies to the industry will only grow. Policymakers are already seeing this inconvenient truth as a reason to put the brakes on renewable energy. In parts of Europe, investment in renewables is slowing as subsidies are cut back. However, the solution is not less wind and solar. It is to rethink how the world prices clean energy in order to make better use of it. At its heart, the problem is that government-supported renewable energy has been imposed on a market designed in a different era. For much of the 20th century, electricity was made and moved by vertically integrated, state-controlled monopolies. From the 1980s onwards, many of these were broken up, privatized and liberalized, so that market forces could determine where best to invest. Today only about 6% of electricity users get their power from monopolies. Yet everywhere the pressure to decarbonize power supply has brought the state creeping back into markets. This is disruptive for three reasons. The first is the subsidy system itself. The other two are inherent to the nature of wind and solar, their intermittency and their very low running costs. All three help explain why power prices are low and public subsidies are addictive.1. Why can photovoltaic cells and wind turbines compete with fossil fuels? ______
单选题Take Nap8 at Work.Apologize to No OneA In the past two weeks I’ve taken three naps at work，a total of an hour or so of shut-eye while on the clock.And I have no shame or uncertainty about doing it.I c
单选题A Among the boutiques in the canal district of Amsterdam is a shoe shop，called W-21，that has a selection of stylish footwear in the window.A select group of customers were recently invited there to ha
单选题A Among the boutiques in the canal district of Amsterdam is a shoe shop，called W-21，that has a selection of stylish footwear in the window.A select group of customers were recently invited there to ha
单选题I thought having a baby would hurt my writing care
单选题. Questions 8 to 11 are based on the conversation you have just heard.1.
单选题《复合题被拆开情况》 Scientists have spent 14 years scanning the brain of a yoga guru 大师. Their findings suggest daily meditation could help protect the brain from aging. According to a study published in the j
单选题. Questions 1 and 2 are based on the news report you have just heard.1.
单选题A third of the planets land is severely degraded and fertile soil is being lost at the rate of 24bn tonnes a year，according to a new United Nations-backed study that calls for a shift away from d
单选题《复合题被拆开情况》 IKEA is a Swedish furniture and home products retailer that has stores all over the world. It is famous for well-priced flat pack furniture that customers assemble at home. It also sells ac
单选题 Americans are a very energetic and mobile people