题目选项分析

According to a prediction of the not-so-distant future published in 1940, electricity would revolutionize agriculture. Electrodes would be inserted into the soil, and the current between them would kill bugs and weeds and make crop plants stronger.

Which of the following, if true, most strongly indicates that the logic of the prediction above is flawed?

【选项】In order for farmers to avoid electric shock while working in the fields, the current could be turned off at such times without diminishing the intended effects.