题目内容
9.听下面一段对话,回答第6和第7两个小题.6.How often should the baby clean his teeth as soon as the first tooth appears?
A.Once a day.
B.Twice a day.
C.Three times a day.
7.When should the baby start using soft toothbrush and a small bit of toothpaste?
A.At about 1 year to 18 months of age.
B.At about 13 to 18 months of age.
C.At about 14 to 18 months of age.
分析 略
解答 BA
点评 略

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