长度为n的顺序存储线性表中，当在任何位置上插入一个元素概率都相等时，插入一个元素所需

At our school ,we sometimes have a special day to help others. Last year we went to an old people’s       and sang songs and performed a play for       . The old people were very         .We should be allowed to take time to do things like that more often. For example, we should       primary schools and help       young students. I want to be a teacher     I’m older, so it would be a great experience for me. Other students would like to do other jobs. For example, my friend Tian Ge wants to       for a newspaper. She should be allowed to volunteer at the newspaper office once a week.

小题1:A.home               B. bank                    C. shop

小题2:A.her                  B. them                    C. him

小题3:A.great               B. happy                   C. smart

小题4:A.buy                 B. have                    C. visit

小题5:A.tell                B. ask                         C .teach

小题6:A.how               B. when                     C. where

小题7:A.write            B. wait                       C. look

对主要从事运输业务的拖拉机，按机动载货车税额的（）计征车船使用税。

A．50%

B．55%

C．60%

D．70%

能增强抗凝血酶Ⅲ（ATⅢ）对凝血因子灭活作用的药物是（）。

A.维生素B₁₂

B.香豆素类

C.阿司匹林

D.维生素K

E.肝素

飞机释放的红外诱饵属于（）。

A.雷达对抗

B.计算机对抗

C.光电对抗

D.通信对抗