为了便于对照检查，测试用例应由输入数据和预期的【 】两部分组成。
参考答案：输出结果
解析：本题主要考查测试的步骤。
I was so familiar with him that I recognized his voice _____ I picked up the phone.
A．as
B．after
C．the instant
D．while
预测我国进入21世纪，人口增长率将可以控制在什么水平以内( )
A．8%
B．10%
C．12%
D．15%
