如果你用地球仪演示地球的公转，在演示过程中，操作错误的是（　　）

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案．

    Online shopping is very easy for young people，but it's difficult for old people．Some Daigou shops，or buy-for-your shops,are1them much.

    Mr Li,a 64-years-you old man,is2his favourite CD in Daigou shop.He says,It's very convenient(方便的)to buy things online，but I can't 3the Internet．I'm lucky to find this buy-for-you shop，as I4to buy an opera CD．I am so happy to get5．From now on，I  6going to look for more things．”A manager of the shop says，“To meet(满足)the needs  7people，I start 8shop．”0ther people9find the large needs in Daigou shops．In many cities，such shops are opening their doors．

    Daigou shops are10for people to shop．

45毫米=____厘米____毫米

9分=____秒             

950克+1050克=____千克．