Codman三角常见于
A．骨肉瘤
B．尤文肉瘤
C．骨软骨瘤
D．脂肪肉瘤
E．骨髓瘤
参考答案：A
—Sometimes, Jim feels stressed, but he doesn’t know _______ about it.
—He can get help from his teachers.
A．who to talk
B．when to talk
C．who to talk to
D．when to talk to
问题病人
