有竞争就会有压力，我们要[ ]
A、把压力变成动力
B、把压力转嫁到他人身上
C、让压力慢慢腐蚀我们的意志
D、放弃竞争
答案：A
When I first met him, it seemed as if he______food for days.
A．did not eat
B．had not eaten
C．was not eating
D．would not have eaten
离子强度的大小，决定于什么？其关系如何？
