2016年6月起大学英语四六级考试听力部分有重大调整。陪伴了中国大学生十几年的“短对话”和“短文听写”将退出历史舞台，取而代之的是短片新闻听力和学术讲座。接下来，同学们可能需要花费很多时间来适应新的听力考试模式，四六级考试网给大家提供英语六级听力在线练习内容，听力的复习没有捷径，只能多听多练了。

点击下载听力素材练习.mp3

【注意：答案在第二页哟~】

听力习题：

　　29.

　　A. The quicker it vibrates, the greater the frequency of sound it produces.

　　B. The slower it vibrates, the higher the frequency of sound it produces.

　　C. The quicker it vibrates, the lower the frequency of sound it produces.

　　D. The frequency of sound it produces is not in proportion to the speed it vibrates.

　　30.

　　A. Those with frequencies lower than 20 hertz.

　　B. Those with frequencies about 21,000 hertz.

　　C. Those with frequencies lower than 20,000 hertz.

　　D. Those with frequencies higher than 20,000 hertz.

　　31.

　　A. A bat caught the insect in midair and ate it.

　　B. Dolphin's clicking sounds bounced off the fish and back to it.

　　C. A person heard an echo when he shouted into the valley.

　　D. A dog heard his owner's whistle because he used ultrasound.

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