生物反馈疗法的原理之一是()
A．经典条件反射
B．操作条件反射
C．内脏操作条件反射
D．内脏活动的无随意性
E．社会观察学习
参考答案：C
Emily’s grandma________poor health for several years，so she always takes care of her after school.
A．joined in
B．has got tired of
C．went through
D．has suffered from
热入血分
