要查询某系统MySQL 数据库中班级名为“一班”的学生的成绩，可以使用下列语句实现：SELECT。FROM 学生，成绩WHERE 学生.学号=成绩.学号AND 学生.班级名=’一班’则，与之等效的语句是（）。

A.SELECT。FROM t1CROSS JOIN t2
B.SELECT。FROM t1INNER JOIN t2ON t1.column1=t2.column2
C.SELECT。FROM t1CROSS JOIN t2ON t1.column1=t2.column2
D.SELECT。FROM t1NATURAL JOIN t2ON t1.column1=t2.column2

A.SELECT。FROM Line CROSS JOIN Vehicle
B.SELECT。FROM Line INNER JOIN Vehicle ON Line.ID =Vehicle.LineID
C.SELECT。FROM Line LEFT JOIN Vehicle ON Line.ID =Vehicle.LineID
D.SELECT。FROM Line RIGHT JOIN Vehicle ON Line.ID =Vehicle.LineID

A.15
B.50
C.不确定，这取决于有多少重名字段
D.100000