F．iles can be lost or destroyed accidentally. Keep(74)copies of all data on removable storage mediA.

A．backup

B．back

C．black

D．backdown

[单选题]F．iles can be lost or destroyed accidentally. Keep(74) copies of all data on removable storage media.A．moveB．pasteC．backdownD．backup

[单选题]F．iles can be lost or destroyed accidentally．Keep (74) copies of all data on removable storage media．A．backupB．backC．blackD．backdown

[单选题]F．iles can be lost or destroyed accidentally．Keep ______ copies of all data on removable storage media.A．backupB．backC．blackD．backdown

[单选题]F．iles can be lost or destroyed accidentally. Keep(72)copies of all data on removable storage media。A．backB．blackC．backdownD．backup

[单选题]I can’t find the key ______the door. Maybe I lost it.A.toB.ofC.withD.for

[单选题]I can't find the key _____the door. Maybe I lost it.A.to B.of C.with D.for

[单选题]I can’t find the key to my office. I _____have lost it on my way home.A.wou

[单选题]Nature is very easily destroyed by __.A． rich peopleB． poor peopleC． natural disastersD． mankind

[单选题] GIF files are limited to a maximum of 8 bits/pixel, it simply means that no more than 256 colors are allowed in （74） .（74）A. an image B. a file C. a window D. a page

[单选题]McKay’s flying documents were destroyed in .A． Belgium B. Germany C. Canada D. England