题目

选择正确的词义。 A. 最重要的;首要的 B. 首先 C. 第一D. 最后的;末尾的 E. 最近的;上一个的 (1) He takes the last bus to go home every day. (2) I want to thank my teacher first. (3) I watched a baseball game on TV with my parents last night. (4) Is this your first time to come to Beijing? (5) Our first goal is to finish the work on time.(3分)溶液在生命活动中起着十分重要的作用。(1)下列物质与水充分混合后,能形成溶液的是__________。A.花生油 B.葡萄糖 C.面粉 D.冰(2)医疗上常用0.9%的氯化钠溶液作为生理盐水,生理盐水中的溶质为__________。一袋100mL(密度约为1g/mL)的生理盐水,所含溶质的质量是__________。
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