定义无符号整数类为UInt,下面可以作为类UInt实例化值的是
A．-369
B．369
C．0.369
D．整数集合{1,2,3,4,5}
参考答案：B
Andy has _____ all of his money and no one would like to help him.[ ]
A. used to
B. used up
C. used as
D. used for
在某个真实或特定的环境下种群的实际出生率叫______。
