有关我国地理位置的叙述，正确的是（  ）

青蛙的幼体和成体的呼吸器官分别是（    ）

先化简，再求值：$\frac{x}{x+2}$÷$\frac{x^2-x}{x^2+4x+4}$－$\frac{x}{x-1}$，其中$x=1+\sqrt{3}$．

完形填空，阅读短文，根据短文选出最佳答案。

                                                                                       Shopping on Taobao

    Where do you often go shopping?

  “Who needs a shopping mall 1we have Taobao?”2 Wang Lin. she is 28 3 old . She is a writer in Beijing. Taobao is China's largest online shopping website. Shopping on Taobao is an important part of Wang Lin's life. She spends lots of money 4Taobao every day.

    Now 5 people like Wang Lin find the joy of shopping online. Among(在……之中) them, women are much more than 6, because they can seldom say beautiful clothes.

   “Taobao” means “look for treasure”in 7. People can find 8 they need on Taobao, 9 candies to DVD players.

Wang Lin says, “It is very cheap". If you don't like the goods (商品), you can get your 10 back. I like shopping on Taobao.

配制下列溶液，所使用的溶剂不是水的是