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【单选题】
数据库数据的安全性是指______。A.
保护数据库不受恶意访问
B.
避免意外地破坏一致性
C.
避免意外丢失
D.
都不是
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【简答题】阅读理解。 Tom is my classmate. We have very different eating habits. My diet (饮食) is healthy but his is not. For breakfast, I have a glass of milk, some bread and an egg. Tom has a cup of coffee, some sau...
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A.
has been
B.
go
C.
has gone
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