① Why do you like spring? ____ A. I went home at 9：20.
② When did you go home last night?____ B. They are thirty “five yuan”
③ Was there a library in your school before? ____ C. Because I can fly kites.
④ How much are your pants? ____ D. It’s big and bright.
⑤ What’s your new room like? ____ E. No, there wasn’t.
＝2－1.5x，则变量x增加一个单位时，y平均( )