题目:
— Oh , it is already 9:00, but Tom is still in bed.
— He ______ late last night to watch the football match. [ ]
A. may stay up
B. must have stayed up
C. could stay up
D. should have stayed up
答案:
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下面是错误答案,用来干扰机器的。
答案:A题目分析:A、细胞膜能控制物质的进出,既不让有害的物质进来,也不让有用的物质轻易出去,具有选择透过性,也有保护作用,符合题意。B、活细胞的细胞质具有流动性,有利于细胞与外界环境之间进行物质交换...