键盘上的Caps Lock键的作用是( )。
A．退格键，按下后删除一个字符
B．退出键，按下后退出当前程序
C．锁定大写字母键，按下后可连续输入大写字母
D．组合键，与其他键组合才有作用
参考答案：C
解析： 退格键是Back Space键，退出键是Esc键，锁定大小字母键是CapsLock键，组合键则是两个或两个以上的键一起使用。故正确答案为C。
| 选词填空从方框中选择合适的单词填入下列句子中。 | |
2. I can't come. I _______ a really busy day . 3. The Greens like to _______ sandwiches with lettuce. 4. Let's _______ some banana smoothie . 5. _______ some more salt to the popcorn, please. 6. You have to _______ the banana before eating it. 7. Can you help me _______ up these tomatoes? 8. Don't _______ waste water into the river. 9. Next you need to _______ all these things into the blender. 10. Finally, _______ on the blender and you'll get some fruit salad. |