【C6】A．periodB．durationC．courseD．length

A．Courses for doctors.B．Courses for businessmen.C．Courses for reporters.D．Courses for

材料题请点击右侧查看材料问题 查看材料A.periodB.levelC.p

【C13】A．periodB．cycleC．timeD．round

【C7】A．intervalB．durationC．spanD．period

【C6】A．distancesB．gapsC．intervalsD．length

53._________A. spanB. durationC. timeD. length