价格效应是指当某商品的价格发生变动时，消费者需求量发生变动的现象。( )
参考答案：对
They often ____ TV on Sundays. [ ]
A. watch
B. watches
C. watchs
D. to watch
呕吐伴眩晕、眼球震颤可见于
A．脑震荡B．脑溢血C．脑梗死D．前庭器官疾病E．眼病
