下列选项中，属于脉管系组成的有（）
A.心脏
B.动脉
C.静脉
D.淋巴管
E.毛细血管
参考答案：A, B, C, D, E
The _______ news made all of us very _____.
A．excited , exciting
B．exciting , excited
C．exciting , excited
D．excited , excited
将十进制数59转换为二进制数是多少？
