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自花授粉作物的自然杂交率低于()%，异花授粉作物自然杂交率一般在？()%以上。[每空1分]
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玉米吐丝
现金流量表(statement of cash flow)
我国国土辽阔，全国土地面积占世界陆地面积的7.4%，耕地面积占全球耕地总面积的（）左右。
The prehistoric monument of Stonehenge stands tall in the British countryside as one of the last remnants of the Neolithic Age. Recently it has also become the latest symbol of another era: the new fiscal austerity. A plan to replace the site？ s run-down visitors center with one almost five times bigger and to close a busy road that runs along the 5,000-year-old monument had to be mothballed in June. The British government had suddenly withdrawn ￡ 10 million, or $16 million, in financing for the project as part of a budget austerity.
Stonehenge, once a temple with giant stone slabs aligned in a circle to mark the passage of the sun, is among the most prominent victims of the government？ s spending cuts. The decision was heavily criticized by local lawmakers, especially because Stonehenge, a UnescoWorld Heritage site, was part of London？ s successful bid to host the 2012 Olympic Games.The shabby visitors center there now is already too small for the 950,000 people who visit Stonehenge each year, let alone theadditional onslaught of tourists expected for the Games, the official says.
Stonehenge is the busiest tourist attraction in Britain？ s southwest, topping even Windsor Castle. But no major improvements have been made to the facilities there since they were built 40 years ago.For now, portable toilets lead from a crammed parking lot, a makeshift souvenir shop in a tent, a ticket office opposite a small kiosk that sells coffee and snacks.
The overhaul was scheduled for next spring in 2011. The plan, held by Denton Corker Marshall, the architectural firm, would keep the stone monument itself unchanged. But the current ticket office and shop would be demolished and a new visitors center would be built on the other side of the monument, about 2.5 kilometers, or 1.5 miles, from the stones.The center would have included a shop almost five times the size of the current one, a proper restaurant, three times as many parking spots and an exhibition space to provide more information about Stonehenge？ s history.
A transit system would have shuttled visitors between the center and the stones while footpaths would have encouraged tourists to walk to the monument and explore the surrounding burial hills. The closed road would be grassed over to improve the surrounding landscape.Last year, the ￡27 million project won the backing of former Prime Minister
Gordon Brown. After more than 25 years of bickering with local communities about how and where to build the new center, planning permission was granted in January. Construction was supposed to start and be completed in time for the Olympics, but the economic recession has changed.
The new prime minister, David Cameron, has reversed many of his predecessor？ s promises as part of a program to cut more than ￡99 billion annually over a period of five years to help to close a gaping budget deficit. The financing for Stonehenge fell in the first round of cuts, worth about ￡6.2 billion, from the budget for the current year, along with support for a hospital and the British Film Institute.
English Heritage, a partly government-financed organization that owns Stonehenge and more than 400 other historic sites in the country, is now aggressively looking for private donations. But the economic downturn has made the endeavor more difficult.
Loraine Knowles, Stonehenge？ s project director, said she was disappointed that the government had withdrawn money while continuing to support museums in London. But she said she was hopeful that English Heritage could raise the money elsewhere. Stonehenge, she said, could then also become “a shining example of how philanthropy could work.”
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