题目内容
The example of an introvert and an extrovert is used to show that______.
查看答案
搜索结果不匹配？点我反馈
更多问题
Chemistry did not emerge as a science until after the scientific revolution in the seventeenth century and then only rather slowly and laboriously. But chemical knowledge is as old as history, being almost entirely concerned with the practical' arts of living. Cooking is essentially a chemical process; so is the inching of metals and the administration of drugs and potions. This basic chemical knowledge, which was applied in most cases as a rule of thumb, was nevertheless dependent on previous experiment. It also served to stimulate a fundamental curiosity about the processes themselves. New information was always being gained as artisans improved techniques to gain better results.
The development of a scientific approach to chemistry was, however, hampered by several factors. The most serious problem was the vast range of material available and the consequent difficulty of organizing it into some system. In addition, there 'were social and intellectual difficulties, chemistry is nothing if not practical, those who practice it must use their hands, they must have a certain practical flair. Yet in many ancient civilizations, practical tasks were primarily the province of a slave population. The thinker or philosopher stood apart from this mundane world, where the practical arts appeared to lack any intellectual content or interest.
The final problem for early chemical science was the element of secrecy. Experts in specific trades had developed their own techniques and guarded their knowledge to prevent others from stealing their livelihood. Another factor that contributed to secrecy was the esoteric nature of the knowledge of alchemists, who were trying to transform. base metals into gold or were concerned with the hunt for the elixir that would bestow the blessing of eternal life. In one sense, the second of these was the more serious impediment because the records of the chemical processes that early alchemists had discovered were often written down in symbolic language intelligible to very few or in symbols that were purposely obscure.
What is the passage mainly about？
A．They were offered free dinners for life.B．They were recruited as guards of honor.C．T
It can be concluded from the passage that______.
Section B
Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide on the best choice.
Two pressing problems face the world: economic meltdown and global warming. Conveniently, a solution presents itself that apparently solves both: governments should invest heavily in green technology, thus boosting demand while transforming the energy business. This notion is gaining agreement around the world. Last month the United Nations called for a "Global Green New Deal". But it is in America that the idea is really taking off. The United States Conference of Mayors reckons that green investment should provide 2.5m jobs. The Centre for American Progress thinks $100 billion worth of spending in the area would provide 2m jobs. The new president tops both. Barack Obama proposes spending $150 billion over ten years, thus helping, he says, to create 5m jobs.
There is a historical parallel to this synergy between two worthy aims. Just as military spending at the end of the 1930s defeated both fascism and the Depression, so spending on fighting climate change should both wean (使摆脱) mankind off fossil fuels and avert what might otherwise turn into the most serious downturn (衰退) since the 1930s. Isn't that neat？ But combining the two by subsidizing renewable energy is, like many easy answers, the wrong solution.
Governments can discourage companies and people from producing CO2 by making polluters pay or by reducing the costs of clean energy. Europe does both, through a cap-and-trade system (which caps CO2 emissions and requires companies to buy permits to pollute) and through subsidies. Mr. Obama is, quite rightly, planning to introduce a cap-and-trade system, but he is also promising massive subsidies.
Subsidies are more popular but both theory and practice argue against them. Subsidizing clean energy requires politicians to decide on the best way of delivering it, and their judgment is likely to be worse than the market's. America's huge ethanol (乙醇) subsidies, for instance, have led to overinvestment in the businesses, which is now experiencing a sharp crash, and have helped drive up the price of food, with painful consequences for the world's poor.
The easy notion that there is a single solution to the world's economic and climatic problems is, thus, a dangerous one. The world needs America to lead the fight against climate change. But if Mr. Obama goes about it the easy way, rather than the right way, he will discredit the cause he advocates, and thus damage the planet instead of saving it.
What is the most striking feature of the Global Green New Deal？
微信支付 
支付宝支付