线性表最常用的操作是存取第i个元素及其前趋的值，则采用 [1] 存储方式节省时间。
参考答案：双向链表
横位
A．35cm，1000gB．45cm，2500gC．16cm，110gD．25cm，320gE．50cm，3400g胎儿身长，体重
Statistics show that men have ___ as women do for every mile they drive.
A．serious accidents as twice many
B．twice as many serious accidents
C．twice serious accidents as many
D．serious accidents as many twice
