问题 单项选择题

SQL语言的GRANT和REVOKE语句主要用来维护数据库的

A.安全性

B.完整性

C.可靠性

D.一致性

答案

参考答案:A

解析: GRANT和REVOKE分别是向用户授予操作权限和收回权限,主要是安全性控制功能。

听力题

阅读下面短文,用括号内所给动词的适当形式填空。(必要时可加情态动词或助动词)

Once there was a baby eagle (1)_________(live) in a nest on a cliff(山崖). The baby eagle loved his nest. It was warm, soft and comfortable. And even better, he had all the food and love that his mother could give. Whenever the baby eagle was hungry, his mother would always come just in time with the delicious food he liked.

He (2) ___________ (grow) happily day after day. But suddenly his world changed. His mother stopped (3) _________ (come) to the nest. He was full of sadness and fear. He thought he (4) _________ (die) soon. He cried, but nobody heard him.

Two days later his mother appeared with some nice food. The baby eagle was wild with joy. But his mother (5) __________ (put) the food at the top of the mountain and then looked down at her baby. The baby eagle cried out. “Mum, why did you do this to me? I’m hungry. Don’t you know I will die if I have nothing (6) __________ (eat)?”

“Here (7) _____ (be) the last meal I give you. Come and get it by yourself, ”his mother said. Then she flew down and pushed the baby eagle out of the nest.

The baby eagle (8) ________ (fall) down, faster and faster. He looked up at his mum, “Why do you abandon me?” He looked down at the earth. The ground was much closer. Then something strange happened. The air caught behind his arms and he began (9) ______ (fly)! He wasn’t moving to the ground any more. Instead, his eyes were pointed up at the sun.

“You(10)_______ ( fly)! You can make it!” His mother smiled.

单项选择题