切配是（）主配料成本的重要环节。
A、关系
B、了解
C、解决
D、决定
参考答案：D
Tom kept quiet about the accident ________ lose his job .
A．so that
B．in order not to
C．so as to not
D．in order that
气体进入人体最先经过呼吸道的（）
A.气管
B.喉
C.鼻
D.口腔
