student表设计如下，查询所有年龄在18-25岁之间的学生姓名和性别的正确SQL语句是（）
A. select sname ,sex from student where （year（getdate（））-YEAR（birth））>=18 and （year（getdate（））-YEAR（birth））<=25;
B. select sname ,sex from student where birth between 18 and 25;
C. select sname ,sex from student where YEAR<=1997 and YEAR>=1990;
D. select sname ,sex from student where birth in （1997,1990）;
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要查询book表中所有书名中包含“计算机”的书籍情况，可用（ ）语句。
A. SELECT * FROM book WHERE book_name LIKE ‘%计算机%’
B. SELECT * FROM book WHERE book_name LIKE ‘计算机%’
C. SELECT * FROM book WHERE book_name = ‘计算机*’
D. SELECT * FROM book WHERE book_name = ‘计算机%’
查询course表中的前5行，正确的语法是（ ）。
A. select top 5 * from course
B. select top（5） from course
C. select top 5 from course
D. select top（5*） from course
select * from student where sno=’05880101’ union select * from student where sno=’05880102’ 与此查询语句等价的选项是（ ）。
A. select * from student where sno=’05880101’ and sno= ’05880102’
B. select * from student where sno=’05880101’ or sno= ’05880102’
C. select * from student where sno=’05880101’
D. select * from student where sno=’05880102’
由两个模数分别为M和N的计数器级联成的计数器,其总的模数为
A. M
B. N
C. MN
D. M/N
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