《流动人口计划生育工作条例》规定流动人口用人单位流动人口计划生育工作职责是（）

A、做好本单位流动人口计划生育工作

B、依法落实法律、法规和规章规定的流动人口计划生育奖励、优待

C、接受所在地的乡（镇）人民政府或者街道办事处和县级以上地方人民政府人口和计划生育部门的监督、检查

The process of gaining or losing weight can be explained by comparing your body to your car. Both run (51) fuel, food for your body and gasoline for your car. Both (52) that fuel, first into heat, then energy, some of (53) is used to do work, and some emitted as waste. And (54) your car uses more energy when the engine is racing than when it is idling, (55) does your body use more energy when you are working hard than (56) you are resting.

For the purpose of this comparison, (57) , there is one significant difference between them. Your car cannot store fuel by turning it into (58) else; all gasoline not (59) remains as gasoline. But your body stores (60) energy as fat. When the gas tank is completely empty, the car won’t run; but your body can burn fat to provide more energy.

54().

A. whereas

B. although

C. just because

D. just as