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【单选题】
下列有关数据库的叙述中正确的是 ( )A.
对于查、添、删、改操作都需由数据库管理员进行完整性定义和安全性授权，由数据库具体执行
B.
数据库系统目录（工程数据库字典）也由一些关系组成，所以用户可以同样对其进行查、添、删、改操作
C.
嵌入式的数据库语言构成的应用程序环境包括主语言和数据子语言，前者能处理记录和域，后者只能处理表，光标机制起着两种语言的桥梁作用。
D.
既然数据库能实现数据对不同用户的共享，那么数据库中不存在任何冗余
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【简答题】Although many people were ____________ (跑去躲雨), they were all pleased, saying that the rain came in the nick of time.
【单选题】Many people were afraid to go to swim when they remembered the scenes________ people were eaten by the big white shark.
A.
in which
B.
by which
C.
which
D.
that
【单选题】How many people were at the meeting?
A.
Four people were at the meeting.
B.
Five people were at the meeting.
C.
Three people were at the meeting.
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