系统是由相互联系和相互作用的诸要素构成的统一整体。系统的基本特征是( )①整体性 ②客观性 ③有序性 ④内部结构的优化趋向
(2013·西工大附中模拟) , I believe, and you will find Tom is very outgoing.
— bargaining is so interesting? —Sometimes it is a test to see who can stand their ground for the longest.
I’ve already forgotten you bought the dictionary.
It is he frequently returns home late makes his parents concerned about him.
(2013·马鞍山模拟)It was not until midnight they reached the camp site.