对膝关节韧带损伤最先检查是
A．关节镜
B．X线应力检查
C．MRI
D．关节造影X线检查
E．X线平片检查
参考答案：E
—What does your brother look like?
—____
A. Yes, he is tall. B. He is tall C. No, he isn’t.
理解繁殖价值、亲本投资、繁殖成本的含义。
