Automation threatens mankind with an increased number of ______ hours.

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问题 Automation threatens mankind with an increased number of ______ hours.

选项 A、useless
B、active
C、complex
D、idle

答案D

解析 (idle空闲的,闲着的)。句意为:自动化对人类造成威胁,因为闲暇的时间越来越多。A.useless无用的;B.active积极的;C.complex复杂的。
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