题干
----How about having a picnic in the park on Sunday?
----__________, whatever you want to do is fine with me.
----__________, whatever you want to do is fine with me.
A： You’re welcome
B： It’s boring
C： It’s up to you
D： It depends
答案(点此获取答案解析）
C
＋2x－4y＝0的圆心，则a的值为