听音频，回答下列问题：A.They have destroyed several small towns.B.They will soon s

听音频，回答下列问题：

A.They have destroyed several small towns.

B.They will soon spread to San Francisco.

C.They have injured many residents.

D.They are burning out of control.

听音频，回答下列问题：

A.Time spent exercising.

B.Time spent working.

C.Time spent on leisure activities.

D.Time spent with friends and family.

听音频，回答下列问题：

A.Since he found a girlfriend.

B.Since he took to heavy smoking,

C.Since he began to exercise regularly.

D.Since he started to live on his own.

听音频，回答下列问题：

A.She is both a popular and highly respected author,

B.She is the most love African novelist of a J1 times.

C.She is the most influential author since the1930s.

D.She is the first writer to focus on the fate of slaves.

A.Because he was setting up a new mail box.

B.Because he parked his car under the "No Parking" sign.

C.Because he was stuck in his neighbors party.

D.Because he couldnt get his car out of the garage.

阅读下列说明，回答问题1至问题4。

[说明]

在多媒体制作领域，音频是不可或缺的部分，通过一些音频处理软件可以完成声音的录制、编辑以及音频的优化等操作。

请说明混响效果(Reverb)在数字声音合成中的主要作用。

阅读下列说明，回答问题1至问题2。

[说明]

某公司要为其制作的多媒体演示系统采集音频素材，并且在计算机内对音频信息进行编辑。

原始声音信号是一种模拟信号，而计算机、数字CD、数字磁道中存储的都是数字化声音。计算机要对声音信号进行处理，必须将模拟音频信号转换成数字音频信号。请说明模拟声音信号数字化过程中的3个基本步骤。