小肝癌是指内径（）的癌肿，其回声强度多为（）。
参考答案：小于5cm；低回声
—Liu Xuan, did you see the Denmark’s famed “Little Mermaid” sculpture in Shanghai Expo?
—No, I didn’t. I _______ it twice in Denmark.
A．have seen
B．were seeing
C．had seen
D．saw
细胞器
