行进指引时应面向用户身体稍许前倾，手掌并拢掌心斜上与身体呈（）角伸出手臂指明（）。
参考答案：45度；目的地
Can you tell me _______ when I called you?
A．what were you doing
B．what are you doing
C．what you were doing
D．what you are doing
多媒体技术与超文本技术的结合，即形成了【 】技术。
