将下列句子按正确顺序排列。(5分)

A. Who is she?

B. She is from Canada.

C. Where is she from?

D. No, she isn’t.

E. She is Judy.

第一句已给出: Is she Maria?

小题1:______ 小题2:_______ 小题3:______  小题4:_______ 小题5:_______

将一支充满二氧化碳的试管倒扣在滴有紫色石蕊试液的水槽中，过一段时间可以观察到试管内的液面开始______，因为______，试管内气压小于外界大气压．试管内液体由紫色变为红色，因为______，文字表达式为______．