题型：单选题题类：常考题难易度：普通

牛津深圳版英语七年级下册Unit 6 Electricity 单元测试.

Stand____ one meter away from the machine when it is on.

A、at last B、at least C、at most D、at times

举一反三

—Why? I don't think they are useful.

—Yes, ________ go for a picnic and relax yourselves?

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