写保护可避免（）。
A、误写操作
B、病毒侵害
C、资料丢失
D、以上都是
参考答案：D
To learn English well, we should find opportunities to hear English_______ as much as we can.
A．speak
B．speaking
C．spoken
D．to speak
迎接外宾的准备包括哪五个方面？
