the decrease. (2)By the end of the study，that percentage had decreased

　　half，to 45 percent. (3)We have no idea when the housing prices decrease

　　the level we can afford. (4)There has been a decrease

　　our imports over the years. on by to in 答案

　　operate v.经营(work)；动手术；操作(机器)(control)；(机器)运转(function)；运作 7. (1)operate on/upon sb.给某人动手术 (2)operation n.操作；经营；手术；运算 be in operation在运转；在行动中；在实施中 come into operation开始工作(生效) put...into operation实施；实行 (3)operator n.(电话)接线员 (1)The department store is well operated. 这家百货公司经营得很好。 (2)Do you know how to operate the heating system? 你知道怎么操作这个加热系统吗？ (3)When does this new law come into operation? 这项新法律什么时候生效？ (4)The plan began to be put into operation. 这计划已经开始实施。 多维训练 (1)单句语法填空 ①You want to let a robot operate

　　me? ②Until the rail links are

　　operation，passengers can only travel through the tunnel by coach. (2)用operate的正确形式填空 ①This machine is very easy

　　.Anybody can learn to use it in a few minutes. on/upon in to operate 答案 ②In the good care of the nurses，the boy is gradually recovering from his heart

　　. ③He dialed the

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