_____ finish their task (任务), the students worked harder and harder.[ ]

A. So as to

B. As to

C. In order to

D. In order not to

有的人乘车、乘船时晕车晕船，你知道这与以下哪个结构有关？

A．外耳道

B．耳蜗

C．前庭与半规管

D．听小骨和鼓室