【C15】A．managesB．controlsC．operates onD．deals with

【C15】A．causeB．courseC．cautionD．case

One of the benefits of the new model is that it is easier ______ than the old one.A．operat

【C20】A．arrangementsB．controlsC．measuresD．warnings

A dirty intercooler on an air compressor will cause _____.A.damage to the un－loader operat

Its not so much that the machine is out of order______ （that) I have not learned to operat

In this story, "rumenotomy" probably meansA．an experiment carried out on a cow.B．an operat