危机是事物（）由（）飞跃的过程。
A、内在矛盾，量变到质变
B、外在矛盾，质变到量变
C、内在矛盾，质变到量变
D、外在矛盾，量变到质变
参考答案：A
— Did your sister pass the exam?
— She failed and is in low spirits.
— I'm sorry for her.
— ______.
A．Thank you
B．You're welcome
C．I would think so
D．Never mind
2.8和2.80，这两个小数它们的大小相同，计数单位也相同．______．
