以滩缓、沙细、浪小、潮平著称的风景名胜区是( )。
A．大连海滨B．青岛海滨C．北戴河海滨D．亚龙湾海滨
参考答案：C
As an English major student, I think business English is more practical than other fields.
A．a English student/field
B．a English major student/regions
C．an English major/courses
D．an English student major/sciences
罗兰C是一种（）双曲线无线电导航系统。
A．低频
B．中频
C．高频
D．超高频
