人体内合成尿素的主要脏器是
A．肾
B．肝
C．心
D．脑
E．肌肉
参考答案：B
At 2004 Athens Olympic Games, Liu Xiang excited people all over Asia when he became the first Asian _______ the gold medal in the men’s 110-meter hurdles.
A．has won
B．won
C．to win
D．winning
什么是计算机硬件、软件？
