公路养护利用车辆进行养护作业时，应当在公路作业车辆上设置（）
A、明显的作业标志
B、高音喇叭
C、彩旗
D、防撞设备
参考答案：A
If the doctor is ______ this afternoon, I will take my little daughter to him for a thorough checkup.
A．accessible
B．available
C．convenient
D．handy
He is new here. He has few friends, _____? [ ]
A. has he
B. hasn't he
C. does he
D. doesn't he
