问题
选择题
----How do you improve your listening skill, Mary?
----I often do it _______ tapes and English radios.
A．by hearing
B．in listening to
C．by listening to
D．for listening
答案
答案：C
题目分析：句意：Mary,你是怎么提高听力技能的？我经常通过听磁带和英语电台来提高。By doing sth.通过做某事，by表示方式，故选C。