78、There are few areas of our lives in which tools don't play an ______ part.
A. indispensable B. independent C. indistinguishable D. indiscriminate
[indispensable]
indispensable 不可或缺的，必要的，必不可少的
expense 花费，费用
expenditure 花费
expensive 花费的
[/indispensable]
[independent]
independent 不可依靠的，独立自主的
[/independent]
[indistinguishable]
indistinguishable 不能区分的，不可辨别的，无法辨认的
[/indistinguishable]
[indiscriminate]
indiscriminate 不辨善恶的，不辨美丑的
[/indiscriminate]
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