单项选择题
A.35cm B.34cm C.30cm D.25cm E.55cm
A.年龄×7+70B.年龄×5+70C.年龄×6+77D.年龄×7+80E.年龄×9+80
A.5cm B.7cm C.10cm D.12cm E.13cm
A.2% B.5% C.8% D.11% E.14%
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