单项选择题
A.1~2B.2.5~3C.2~3.9D.4~5
A.10.5~11.5B.11.5~12.5C.13.5~15.5D.14.5~18.5
A.50%B.60%C.70%D.80%
A.白麦和红麦B.花麦和白麦C.春麦和冬麦D.软麦和硬麦
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