中国移动通信的手机客户必须激活（）功能才能使用多方通话功能。
A、呼叫等待
B、呼叫转移
C、组群通话
D、呼叫限制
参考答案：A
Roy made several kites, but _____ of them can fly high in the sky.
A．neither
B．none
C．all
D．most
No matter how low you consider yourself，there is always someone _______ you wishing they were that high.
A．getting rid of
B．getting along with
C．looking up to
D．looking down upon
