岩石只是经过破碎、剥蚀、搬运、沉积过程后形成的土颗粒的矿物成分与母岩相同。
参考答案：对
如图是没有组装的滑轮组，若用它提升重物，请用笔画线代表绳子，组成最省力的装置图．
_______ many children like KFC, I think they'd better try not to eat it too often.[ ]
A. Because
B. When
C. Although
D. If
