The book which is ________ 100 yuan is not worth ________.
A：cost; buying
B：worth; to be bought
C：worth; buying
D：paid; buying
遗传因子组成不同的个体叫做____ ．
一架飞机从湛江起飞，沿同一纬线圈向东飞行，途中保持方向不变，这架飞机最终（ ）
