风险控制成本与风险损失波动较大是（）的劣势。
A.风险保留
B.风险回避
C.风险控制
D.风险分散
参考答案：C
—I’ve heard that he is seriously injured in the accident.
— . He’s being treated in hospital.
A．I hope not
B．I’m sure
C．I don’t think so
D．I’m afraid so
如何更了解学生？
