2﹣1等于____ .
① How much do you need ? ____ A. 让我们列个清单吧!
② Let's make a list. ____ B. 你想要多少果汁 ?
③How much juice do you want ? ____ C. 让我们去购物吧!
④ Let's go shopping. ____ D. 你能看见多少只鸭子?
⑤How many ducks can you see ? ____ E. 你需要多少?
下列物质与水混合能形成溶液的是:( )