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二、用正确的情态动词填空。 1. You have been working all day. You_____be very tired. 2. My sister _________ have phoned me this morning, but she forgot. 3. My grandpa is over ninety, but he ____ read without glasses. 4. ______ all your dream come true! 5. Anyone _____ be punished if he breaks the law. 6. We have enough food, so you ____ buy anything. 7. When I was young, I______ play badminton with my parents. 8. When he was two, he ______ draw well. 9. She ____ have left school, for I saw her a minute ago. 10. We ______ to respect our teachers.
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【单选题】信息系统中讨论对象,操作系统、数据库以及数据库语言SQL中可用不同术语,例如在文件系统中的记录在关系模型中所对应的术语为( )。
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数据
B.
元组
C.
实体
D.
对象