Boesel uses spin bikes made by Resource Fitness，a Seattle company he co-owns，that captures energy produced from the flywheel. Wires send the converted AC current（交流电流）

　　into any standard wall outlet-for this reason，the product line's name is Plug Out-and the energy created is used before the building draws power from the grid（电网）．Unlike the Green Revolution equipment，Plug Out machines cannot store extra energy. A third company，the Florida-based ReRev，is adding converters to a specific brand of spin bikes. But since the converters add＄1，000 to the price of the equipment，the ReRev and Green Revolution machines

　　are at a disadvantage．

　　Resource Fitness，by contrast，sells its equipment for the same＄1，200 price as non-

　　electricity-producing machines，removing the question of how long it will be until the energy

　　savings pay for the cost of the unit．The company can afford to do this because its designs don’t

　　call for the extra wiring needed for battery packs and large converters．It is also trying to price

　　competitively with standard equipment so more gyms-and gym Boers-will make the switch．

　　63．Members of the Green Microgym earn gift certificates for＿．

　　A .using the man-powered exercise equipment

　　B. saving electricity for local businesses

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