A、Engineering problems. B、The air pollution it produced. C、Inadequate funding. D、The opposition from the military. C事实细节题。新闻中提到，

The world’s largest aircraft has taken to the skies for the first time. The Airlander 10 spent nearly two hours in the air, having taken off from Cardington Airfield in Bedfordshire. During its flight, it reached 3,000 feet and performed a series of gentle turns all over a safe area. The aircraft is massive—as long as a football field and as tall as six double-decker buses and capable of flying for up to five days. It was first developed for the US government as a long-range spy aircraft, but was abandoned following budget cutbacks. The aircraft cost 25 million pounds and can carry heavier loads than huge jet planes while also producing less noise and emitting less pollution. The makers believe it’s the future of aircraft and one day we’ll be using them to go places. But there’s still a long way to go. The Airlander will need to have 200 hours’ flying time before being allowed to fly by the aviation administration. If it passes though, we can hope we’ll all get some extra leg room.
5. What do we learn about the first flight of the Airlander 10?
6. What cause the US government to abandon the Airlander 10 as a spy aircraft?
7. What is the advantage of the Airlander 10 over huge jet planes?