市场挑战者如果要向市场主导者和其他竞争者挑战，首先必须确定（）。
A.战略目标和挑战对象
B.竞争策略
C.竞争者的优劣势
D.市场规模
参考答案：A
当学完单词football(足球)之后，再学习ball(球)时，学生觉得很容易掌握，这种迁移叫______。
He inventing a new machine used to handle waste water. [ ]
A. got credit for
B. did credit for
C. took credit to
D. had credit to
