Any good mystery must eventually uncover a villain, and in a recent documentary, "Who Killed the Electric Car", the filmmakers duly pointed the finger at General Motors. The 5 is not so simple, but there is little doubt that when GM pulled the plug on its EV1 battery-powered car a decade ago, other 6 followed the Giant carmaker’s lead. Yet GM has now 7 its enthusiasm for electric vehicles — or at least for their close cousins, hybrid cars (混合动力汽车). At the upcoming auto show, the company is expected to 8 a prototype that overtakes existing hybrids, 9 Toyota’s Pruis. Today’s hybrids capture energy normally 10 during braking and coasting and use it to power an electric motor that can provide extra bursts of 11 when needed. The Pruis and other hybrids can also run 12 battery power alone at low speeds over short distances, such as in stop-start traffic. But GM’s new car is expected to be a "plug-in" hybrid, which, as its name implied, can be recharged by 13 it into the mains (干线). Together with a big battery pack, this provides a much larger range in all-electric 14 , after which the petrol engine kicks in. GM’s car is expected to go around 50 miles (80 km) in all-electric mode, 15 enough for American commuters, who would need to use the 16 engine on longer trips only. The 17 is that plug-in hybrids need a much larger and more costly battery pack. 18 a Pirus to operate as a plug-in hybrid, as some enthusiasts have done, costs around $12,000. GM bosses have hinted that his company planned to put a plug-in into mass 19 . It is an indication of how the pace is 20 in the race to develop more eco-friendly cars. Others are more 21 . Carlos Ghson, the boss of Renault and Nissan, who is 22 for his skepticism towards hybrids, said he still had doubts that hybrid technology is 23 for the mass market, stressing that plug-in hybrids will have to wait until battery technology improves. Toyota has also been 24 about plug-ins, insisting the Pims’ approach is more convenient.
A. form
B. occasion
C. mode
D. situation