题目

BFever has usually been regarded as a threat to health.However,no one has actually proved that fever is dangerous.This fact attracted the attention of Matthew J.Kluger.Imagining that fever might not be as harmful as it had been supposed,Kluger set up a series of experiments with lizards(蜥蜴).What Kluger and his team did his team did in their first experiment was simple.They put some lizards in a sand-box,one end of which was heated to 44℃,while the other was at a room temperature.It was found that the lizards moved form one part of the box to the other in order to keep a constant temperat18．据国家统计局《国民收入统计资料汇编》显示，从l952年到l957年，农业产值增长了24.8%，工业产值增长为128.6%．在全部工业产值中，以农产品为主要原料的产值约占50%左右，农副产品和用农业原料制成的工业品，在国内市场主要商品供应量中约占90%左右，在出口总额中约占75%左右。上述材料反映了（　　）①农业集体化有利于工业化    ②建立了完备的工业体系③计划经济取得了一定成效    ④外贸出口额大幅度增长。A．①③B．①②③C．②④D．①③④