题目

You look so tired tonight. It is time you_______. A . go to sleep B . went to sleep C . go to bed D . went to bed 答案：D6旬老人靠喝雨水创造了被埋196小时生还的“生命奇迹”．她喝的雨水属于A.纯净物B.混合物C.单质D.有机物