At first driving requires a lot of concentration, but over time, it just becomes_____.
A．a(chǎn)uthenticB．a(chǎn)vailableC．a(chǎn)utomaticD．a(chǎn)wake
C
句意:一開始駕駛需要集中精力,但是一段時間后就成為無意識的行為。automatic 意思為“無意識的；不經(jīng)思考的”，英語解釋為done without thinking about it，這與題干中concentration（the ability to think carefully about something you are doing）相對應(yīng)。authentic可靠的；真正的；available可用的；有效的；awake 醒著的;清醒的。
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