题目

阅读理解 For Suilasaikhan, a man living in the Inner Mongolia Autonomous Region(IMAR)(内蒙古自治区), life was hard years ago. When the wind blew, the sand made it almost impossible for him to see anything. He had to find his way back home by following the barking of dogs. Thankfully, things are much better today. About one third of the desert is now covered with trees, and sandstorms are less common. Ian Teh, who comes from Malaysia, came to China last year and was amazed to see people planting trees in the several deserts in northern China. To be honest, it was hard to imagine it wa完成下列单位换算：2安=2×1032×103毫安=2×1062×106微安  200毫安=0.20.2安=2×1052×105微安．