听下面一段对话，完成下面小题。
【小题1】Where did the boy know the news?

A．In a TV show.

B．In a book.

C．On the Internet.

【小题2】Is there any water on Mars?

A．Yes, there is.

B．No, there isn’t.

C．We don’t know.

【小题3】The scientists have already got some photos of Mars, haven’t they?

A．No, they haven’t.

B．Yes, they have.

C．We don’t know.

【小题4】Have they discovered life in the space?

A．We don’t know.

B．Yes, they have.

C．No, they haven’t.