报关企业及其垮关区分支机构注册登记许可的有效期均为3年。

Soon, more of the information we receive via the Internet could come (31) in digital wrappers.

Wrappers are made up (32) software code that’s targeted to do specific things with the data (33) within them, such as helping to define queries for search engines. They also keep (34) from (35) access to that code.

32（）

A.of

B.off

C.on

D.out