—He got his first book published. It turned out to be a bestseller.

—When was _____?

—_____ was in 2000 when he was still in college.

A．that; This

B．this; It

C．it; This

D．that; It

在计算机中，最适合进行数字加减运算的数字编码是______，最适合表示浮点数阶码的数字编码是______。

A．原码
B．反码
C．补码
D．移码