【题目】— What about the protection of these new machines?
— Let’s keep the surface ________ dust by putting a cover over them.
A. far from B. apart from
C. free from D. away from
在线课程【答案】C
【解析】考查介词短语辨析。A, B, D 选项的意思均为使··远离··，只有A项意思为使··免受··。根据句意“让我们盖上机器，以免蒙尘。”可知，A项正确。故选A。