题目

选择正确的单词填空。was werein well on （1） Theremany trees three years ago. （2） They took about five days to get there1969. （3） I looked it upthe Internet. （4） My brothervery short before, but no he is tall. （5） I couldn't ride my bike. 答案：【1】were 【1】in 【1】on 【1】was 【1】well请写出一个开口向下，并且与x轴只有一个公共点的抛物线的解析式，y=________．