A:43
B:45
C:54
D:34
— Is there a library in Gaochun?
— Yes, a new library _______ and is now open to the public.
设集合A={x|x2﹣(a+3)x+3a=0},B={x|x2﹣5x+4=0},集合A∪B中所有元素之和为8,则实数a的取值集合为( )
世界面积最大的咸水湖是( )