One day Mrs. Wilson went shopping with Tracy and Ben. They went to the supermarket in the new shopping center.” Why do you buy things here?” Tracy wanted to know. “Because they are cheaper here than at the corner store near our home,” Mrs. Wilson said.” Help me check the prices, please.” The Wilsons were not rich and Mrs. Wilson was always careful with her money. She looked carefully after the prices of things. She bought lots of things in the supermarket. When they got home, the children said,“ We don't think you saved money by going to the supermarket.” “Of course I did,” Mrs. Wilson said. “ Everything was cheaper there.” “We know,” the children said,“ but we came home by taxi because we had too much to carry. The taxi fare was more than the money that you save! ” Mrs. Wilson added everything up. Her children were right.

“它使世界开始连成一个整体，使欧洲商道和贸易中心发生转移”。“它”是指（     ）

观察动物细胞时，没有观察到的结构是（　　）

给下列各字选择正确的读音。

迎着朝____（zhāo  cháo）阳    开花结____（jiē  jié）果

扇____（shān  shàn）动翅膀    瓜秧拖蔓____（màn  wàn）

播种____（zhǒnɡ  zhònɡ）希望    傍____（pánɡ  bànɡ）晚时分

气氛沉闷____（mēn  mèn）    轮流照看____（kān  kàn）