昆虫幼虫经过多次蜕皮才能发育成成虫，蜕掉的皮是 [ ]

A．昆虫幼虫的表层皮肤

B．昆虫幼虫的皮层

C．昆虫幼虫的外骨骼

D．昆虫成虫的外骨骼

As the final exam is coming, my pressure ________， and I'm afraid it will ________ my failure.[ ]

A．builds up; lead to

B．comes up; cause to

C．turns up; bring about

D．makes up; stick to