The purpose of the University of Illinois experiment was to figure out______. A．schoolchildren's cognitive development B．the fitness levels of today's school children C．the effect of exercise on children's brains D．the structure of immature human brains
A. A．schoolchildren's B.the C.the D.the
【参考答案】
C 解析：根据题干中的University of Illinois和experiment将本题出处定位到首段。该......