对象实现了数据和操作的结合，使数据和操作______于对象的统一体中。
A．结合
B．隐藏
C．封装
D．抽象
参考答案：C
根据句子意思及首字母提示完成单词。
1. Candy is her favourite food, but it isn't h _____ food.
2. Daming can play table tennis but he can't play the p_____.
3. My parents live in Beijing. I often s_____ emails to them.
4. Tom usually plays basketball but he n_____ plays computer games.
5. We can download music from the I_____.
可产生抑制性突触后电位的离子基础是
A．K+B．Na+C．Ca2+D．Cl-E．H+
