单项选择题A．Helping the needy to survive.B．Sharing risks of possible losses.C．Being compulsory in most countries.D．Covering differently according to different situations.

单项选择题A．He was the first person to appear on television.B．It was he who discovered the wonder of television.C．He made the very first step towards the invention of television.D．He developed the television and was the first person to demonstrate it.