Lucy got up late this morning, _____ she didn't catch the early bus.[ ]

A. because            

B. for            

C. so              

D. or

在低温条件下应按下列步骤启动发动机，将启动开关钥匙转动到（）位置，启动发动机。

A.ON

B.OFF

C.START

D.HEAT