◎ 题干
Peter is sixteen and his sister is two years         ,but she is in a higher grade.
[     ]
A. young
B. younger
C. old
D. older
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Peter is sixteen and his sister is two years,but she is in a higher grade.[ ]A. youngB. youngerC. oldD. older…”主要考查了你对  【形容词的比较级,形容词的最高级】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。