I hear the tall girl wearing glasses is your new classmate. She's from America, ________? [ ]

A. has she

B. isn't she

C. hasn't she

D. does she

如图是用螺丝刀撬开饼干盒盒盖的情形，饼干盒盒盖难以撬开，是因为盖子和盒子之间 _________较大，螺丝刀在撬开盒盖时，其功能相当于简单机械中的__________。