题目

下列供热方式最有利于环境保护的是（      ）A．用煤做燃料供热                 B．用石油做燃料供热   C．用天然气或煤气做燃料供热        D．用太阳能灶供热  答案：D解析:略 Many Chinese teenagers dream that they can go to Beijing       the Olympic Games this summer． A．watch                  B．watches               C．to watch                D．watching