题目内容

Americans like to adopt Korea children because there are more orphaned and abandoned children in South Korea.

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上路行驶的机动车未随车携带身份证的，交通警察可依法扣留机动车。

A. 对
B. 错

第(24)至(26)题基于“学生-选课-课程”数据库中的如下三个关系：学生基本信息：S(S#, SNAME,SEX,AGE) 选课信息：SC(S#, C#,GRADE) 课程信息：C(C#, CNAME, TEACHER) 若要求“查询选修了C2号课程的学生的学生号”，正确的关系代数表达式是 Ⅰ．π[S#](σ[C#=’C2’](SC)) Ⅱ．σ[C#=’C2’](π[S#](S×SC)) Ⅲ．σ[C#=’C2’](π[S#](SC))

A. 只有Ⅰ
B. 只有Ⅱ
C. 只有Ⅲ
D. 都正确

When Susan Cox was adopted, she was raised in the American way happily.

Many communities offer ______ for bicultural children to learn about their native culture together in a fun environment.