Question

—        do you know so much about the UFO?
—I usually get the information by surfing the Internet.

A．How

B．What

C．Which

D．Where

Answer 1

A

How如何，怎样；What什么；Which哪一个；Where在哪儿。根据下文，我通常通过上网来获得信息。可知上文问的是，关于飞碟，你是如何知道这么多的？故选A。