以下各项中，( )是正确的期货的合约名称。

A．上海期货交易所阴极铜期货合约
B．3月份交割大豆合约
C．实物交割绿豆期货合约
D．每手5吨的天然橡胶标准合约

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.

（72）处填（）。

A．of

B．off

C．on

D．out