Oil is ( ) machinery to reduce the friction.

Oil is ( ) machinery to reduce the friction.
A、put in
B、turn over
C、take out
D、track down
【正确答案】:A
【题目解析】:本题考查动词短语辨析。put in“把…放于”, turn over“翻转”, take out“取出”, track down“追踪”。句意:把油涂到机器上减少摩擦。故选A。