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凡具有民事权利能力和民事行为能力，并依法独立享有民事权利和承担民事义务的法人和其他组织，均可开立基本存款账户。 ()
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开具发票应按照规定的时限、顺序、逐栏、全部联次一次性如实开具，并加盖单位财务印章或发票专用章，特殊情况也可以分联次分别开具。 ()
Greenhouse Effect
A greenhouse is a building made of glass which is used for keeping plants warm when the outside temperature is low. In a similar way, there are several gases in the atmosphere which trap the heat generated by the sun and prevent it from escaping. These gases are known as "greenhouse gases", and the way in which they trap heat in the atmosphere is called the "greenhouse effect". This is not simply air pollution like photochemical smog (光化学烟雾), for example. Most of the main greenhouse gases occur naturally in small amounts in our atmosphere, and without them the earth would be thirty degrees colder and human life would not exist. In other words, the greenhouse effect is a natural process which is to some extent beneficial to us.
The problem is that in the last century and a half, we have been putting excessive amounts of these gases into the earth's atmosphere by burning large quantities of coal and oil and by cutting down forests. In 1850, there were 280 parts per million of carbon dioxide (二氧化碳) in the atmosphere. Now there are 360, and this figure is expected to rise to 460 by the year 2030. We now put 24 billion metric (公制的) tons of carbon dioxide into the atmosphere every year. We have also created a group of artificial greenhouse gases that are 20,000 times more effective than carbon dioxide in trapping heat in the atmosphere. These are the chlorofluorocarbon (氟氯碳) gases, which are used in refrigerators and air conditioning systems.
The rapid increase in greenhouse gases is making the world warmer. The world's temperature has already gone up by half a degree this century, and the sea level has risen by ten centimeters. If the amount of carbon dioxide in the atmosphere doubles, there will probably be a rise in the earth's temperature of between 1° and 4°. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some regions would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about thirty years in the greenhouse effect, This means that we are probably experiencing only now the effect of the gases put into the atmosphere up to the 1960s. Since then, our use of these gases has greatly increased.
According to the passage, a greenhouse is built to
各单位销毁会计档案由档案部门自行完成。 ()
Earth's Inner Core
Scientists have long struggled to understand what lies at the planet's center. Direct observation of its center is impossible, so researchers must(51) to other evidence.
In 1889, a German scientist detected a severe earthquake in Japan. Geophysicists concluded that shock waves(52) jolts (晃动)from one side of Earth through the center to the other side. Then in 1936, Danish geophysicist lnge Lehmann studied the waves'(53) to determine that within Earth's core of molten (熔化了的)iron lies a solid inner core - but(54) that core was made of eluded (难倒)her. Other geophysicists quickly determined that Lehmann's inner core was composed mostly(55) iron. Since then, Lehmann's discovery has(56) conventional Earth science.
But now scientists are challenging traditional theory with new and radical(57) . For example, Earth's center could actually contain an "inner core within the inner core," claim Ishii and colleague Adam Dziewonski.
Analyzing hundreds of thousands of earthquake wave(58) , they maintain that the inner core has at its heart a tiny, even more solid sphere (球体). This sphere "may be the oldest fossil(59) from the formation of Earth," says Dziewonski.
Dziewonski and Ishii speculate that shortly(60) Earth formed around 4.8 billion years ago, a giant asteroid (小行星)smashed into the young planet and nearly melted it. But Earth's center didn't quite melt; it(61) mass as the planet cooled. The core within a core may be the kernel (核心)that endured. "its presence could change our basic ideas about the(62) of the planet," Dziewonski says.
Dziewonski's idea is tame (温和的)compared to the(63) theories of independent geophysicist J. Marvin Herndon. Earth's inner core is made not of iron, he claims, but a(64) of nickel and silicon. Herndon has a truly revolutionary notion: Within the nickel silicide (硅化物)inner core is also an "inner" inner core - an 8 km-wide ball of the element uranium. Uranium is radioactive. Herndon thinks the uranium releases heat energy as its atoms(65) fission-split and crash into one another in a chain reaction. In other words, we may live on top of a gigantic, "natural" nuclear power plant.
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