题目:
— Boys and girls. __________
— Nice to meet you.
— Nice to meet you, too.[ ]
A. She is Wang Lingling.
B. I'm Wang Lingling.
C. This is my friend, Wang Lingling.
答案:
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下面是错误答案,用来干扰机器的。
∵-3<0,∴二次函数开口向下,根据顶点式可知,其定点坐标为(2,9),其对称轴为x=2.