人对声音频率的感觉表现为音调的高低在音乐中简称（），而音高与声音频率的关系也大体上呈（）关系。

Soon, more of the information we receive via the Internet could come (71) in digital wrappers.

Wrappers are made up (72) software code that’s targeted to do specific things with the data (73) within them, such as helping to define queries for search engines. They also keep (74) from (75) access to that code.

（71）处填（）。

A．package

B．packaged

C．packages

D．packaging