在科幻电视连续剧《魔幻手机》中，科学家将穿梭多维空间的新功能植入一款名叫“傻妞”的手机中，“傻妞”穿梭时空回到唐朝，帮助孙悟空制服了黄眉大王。帮助人类实现“穿越时空”梦想的理论依据之一是  [ ]

A．量子论

B．相对论

C．牛顿力学

D．细胞学说

It's impossible for a child to do so much work within a short period of time, ______

A. isn't it


B. is it
C. has it



D. hasn't it