锅炉本体是（）和（）两大部分组成。
参考答案：锅、炉
of the money been spent recycling the rubbish. [ ]
A. Three fourths, has
B. Three fourths, have
C. Three fourth, has
D. Three fourth, have
踢足球时，球被踢飞了，施力物体是______，受力物体是______；脚感到疼，施力物体是______，受力物体是______．
