单项选择题Read the following story about how moviemakers showed the actor Christopher Reeve flying in the movie Superman. Then answer the inference questions that follow. When Superman speeds across the heavens to save Lois Lane or fearlessly dives and swoops around the skyscrapers of Gotham or over the San Andreas Fault, kids really believe he’s flying and many of the rest of us come close to believing, too. That’s because the moviemakers put a lot of effort into not only getting Christopher Reeve airborne, but making the action of flying and all it entails really convincing, right down to the rippling of wind through his board blue cape. Getting actors and actresses off the ground by means of camouflaged (隐蔽起来的) wires is nothing new. But whereas in the past the flyer was suspended on only one wire and had little maneuvering ability as a result, a new system involves two wires, one from each hip. Superman wore a fiber-glass hip harness --- or plastic underwear lined with fleece --- and to this the wires were attached via ball-bearing swivel joints (滚珠轴承转动接头). High overhead the wires met a bar with a supporting system of cables and sheaves, operated by hydraulic (液压的) rams. There, too, was a track along which the wires were moved, conveying Superman around the studio --- with some near misses of the sets ---landing our hero in a net. The wires were painted blue when Superman flew against a blue screen, and sometimes a completely new background was substituted so that no wires would be seen. A crane (吊车, 起重机) specially built for the effect was 250 feet high, and Reeve courageously veered (转动方向) around the studio, often at height of 200 feet. Despite Reeve’s exceptional skill at this --- something to consider when it is usually inanimate objects we see hurtling through the heavens in films these days --- there was initially something not quite right about his flying. The cape wouldn’t swirl properly and no wind machine was capable of making it do so. Les Bowie, responsible for matte painting in the film, came up with an unprecedented solution. He made a device, controlled by radio, that operated long rods and these in turn were attached by lines on Superman’s cape. Somehow the various motions of the rods could make the cape billow and furl as naturally as clothes hung out to dry on a windy day. 12. Actors and actresses ______. A、have never appeared to be flying before B、before did not have much control over where they flew C、have appeared to fly just the way Christopher Reeve did D、often refuse to fly by wires
