题目

At first driving requires a lot of concentration, but over time, it just becomes_____.    A.authentic    B. available    C. automatic     D. awake  答案:C 解析: 句意:一开始驾驶需要集中精力,但是一段时间后就成为无意识的行为。automatic 意思为“无意识的;不经思考的”,英语解释为done without thinking about it,这与题干中concentration(the ability to think carefully about something you are doing)相对应。authentic可靠的;真正的;available可用的 ;有效的;awake 醒着的;清动物细胞有细胞壁,起支持和保护的作用。                             (  )
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