汽车防盗装臵由（）和防盗警告灯等组成。
A．防盗控制单元
B．开关
C．脉冲转发器
D．识读线圈
参考答案：A, C, D
Global warming caused by human being’s casual behaviour has become a major _______ for people all over the world.
A．conflict
B．concern
C．challenge
D．factor
设奇函数f（x）的定义域为R，且周期为5，若f（1）＜-1，f（4）=log2a，则实数a的取值范围是______．
