________is your class teacher？My class teacher is of average height．A.WhoB.How oldC.How highD.How tall
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D解析分析：is of average height(处于平均高度)，所以是问“身高”，问“人”的身高时应该用how tall，而问“物”的高度时用how high(但对植物也用how tall，对建筑物可以用how tall也可以用how high)(延伸)How old is he？＝What's his age？／How long is the wood？＝What's the length of the wood．？