《鲁滨逊漂流记》的作者是根据（）来写这本书的
参考答案：一些航海家和流亡者的记载
已知函数y＝－x3＋bx2－(2b＋3)x＋2－b在R上不是单调减函数，则b的取值范围是________．
Doctor Nathan is said to have been ________ to researching into wild animals in Africa for more than
ten years.[ ]
A. absorbed
B. devoted
C. concentrated
D. engaged
