问题
单项选择题
(74) systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and (75) on the disk, and controlling peripheral devices such as disk drives and printers.
A．contents
B．directories
C．directions
D．direct
答案
参考答案：B
解析：directories意思为“目录”。Direction意思为“方向”。答案为B。