小朋友做早操,9个人排成一行,前后两人之间的距离是2米,从第一个小朋友到最后一个小朋友的距离是多少米?
(9-1)×2=16(米)
Sorry, I forgot _____ a pen. May I use yours?[ ]
A. buy
B. to buy
C. buying
韩-薛-柯病三大典型症状是__________、__________和_________。