题目内容
Panama,____ country in Central America, is the only place in the world ____ someone can see the sun rise on the Pacific Ocean and set on the Atlantic.
A. the, in what B. a, where C. /, where D. a, which
B
星级口算天天练系列答案
芒果教辅达标测试卷系列答案An experimental solar-powered plane landed safely Thursday after completing its first 24-hour test flight, proving that the aircraft can collect enough energy from the sun during the day to stay aloft(在空中) all night.
Pilot Andre Borschberg eased the Solar Impulse onto the runway at Payerne airfield about 30 miles southwest of the Swiss capital Bern at exactly 9 a.m. (3 a.m. EDT) Thursday. Helpers rushed to stabilize the pioneering plane as it touched down, ensuring that its massive 207-foot wingspan didn't scrape the ground and topple(倾倒) the craft.
The record feat(壮举) completes seven years of planning and brings the Swiss-led project one step closer to its goal of circling the globe using only energy from the sun. ‘We achieved more than we wanted. Everybody is extremely happy,’ Borschberg told reporters after landing.
Previous flights included a brief ‘flea hop’ and a longer airborne test earlier this year, but this week's attempt was described as a ‘milestone’ by the team. The team said it had now demonstrated that the single-seat plane can theoretically stay in the air indefinitely, recharging its depleted batteries using 12,000 solar cells and nothing but the rays of the sun during the day. But while the team said this proves that emissions-free air travel is possible, it doesn't see solar technology replacing conventional jet propulsion(喷气推进) any time soon. Instead, the project's overarching purpose is to test and promote new energy-efficient technologies.
Project co-founder Bertrand Piccard, himself a record-breaking balloonist, said many people had been skeptical that renewable energy could ever be used to take a man into the air and keep him there. ‘It’s a matter of time that people come to believe and understand about renewable energies,’Piccard said, adding that the flight was proof that new technologies can help break society's dependence on fossil fuels.
The team will now set its sights on an Atlantic crossing, before attempting a round-the-world flight in 2013, making only five stops along the way. ‘It's absolutely not time to relax,’ said Piccard.
Title: A __________ in solar-powered flight and its background information
| A project on solar-powered flight | Main purpose: To test and promote __________ __________: To make an Atlantic crossing; To attempt a round-the-world flight with only five stops in 2013. Long-term goal: To circle the globe using only __________. |
| __________ | a brief ‘flea hop’; an airborne test. |
| Record-setting test flight | Name of the plane: __________ Name of the pilot: Andre Borschberg Time: __________ Length of Place: at Payerne airfield, Switzerland. Achievements: ●proving that the aircraft can collect enough energy from the sun during the day to stay aloft all night, making __________ possible; ●proving that new technologies can help rid society of __________ fossil fuels; ●bringing the project __________ to its long-term goal. |