试述影响经济行情变化的非周期性因素和经济行情之间的联系。
参考答案：
-- How did you find your trip to Huangshan?
-- ______ .
A．I went there by air
B．A friend took me there
C．Wonderful indeed
D． In a travel book
抑郁发作睡眠障碍的特点是
A．入睡困难
B．早醒
C．易惊醒
D．多梦
E．睡眠过多
