题目：
Read and fill in the blanks. （阅读上下文，补全对话）
Alice: Where is my dress?
Mike: 1._____ 2. _____ your dress, Alice?
Alice: No, it 3._____.
Mike: What 4._____ is it?
Alice: Red.
Dad: Is that your 5._____, Alice?
Alice: Yes, 6._____ 7._____. Thank you.
Mike: Mom, 8._____ trousers are they?
Mom: They are your baby brother's.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：E解析：脑底动脉环的主要功能是平衡血流，保持脑血液均衡配布。
