Not only the students but also their headteacher _______ signs asking for old books . A.put up B.put off C.puts up D.puts off 答案:C读下图,并根据要求完成下列问题(14分)。(1)图中EOF为晨昏线,用斜线阴影在图中标出黑夜部分;其中EO为 线,OF为 线。(2)比较图中A、B、C、D四点的角速度大小:______________________________。(3)比较图中A、B、C、D四点的线速度大小: ______________________________。