单项选择题
A.6% B.9% C.12% D.15% E.16%
A.24％ B.26％ C.35％ D.37％ E.32％
A.18％ B.22％ C.15％ D.19％ E.13％
A.10% B.15% C.20% D.25% E.30%
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