A battery-driven bus has been developed by a group of British companies. The bus, a fifty- passenger single-deck (1) , is to go into (2) in Manchester shortly, and discussions with the Department of the Environment are (3) to lead to a (4) batch (批) of twenty going into (5) passenger service in Manchester within two years. Unlike the small govemment- sponsored battery bus now (6) trials in provincial cities, (7) low speed and range effectively limits it to city centre operation, the new Silent Rider, (8) a range of 40 miles between charges and a (9) of 40 m.p.h., will take (10) place with diesel (柴油) buses for normal urban and suburban (11) .
Its capital (12) is higher (13) lower maintenance and fuel costs bring it (14) to a fully competitive cost with the diesel bus over a thirteen- year life，without (15) into account the environmental bene
A. existence
B. process
C. occurrence
D. operation
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