题目

From a _____ look in his eyes, I bet he didn't get the hang of the meaning of the poem. A. frightened        B. satisfied      C. puzzled        D. excited   答案：C对孟德尔选用豌豆做实验材料并获得成功的原因，下列解释中不正确的是(　　)A.豌豆具有稳定的、容易区分的相对性状B.豌豆是严格的闭花传粉植物C.豌豆在杂交时，母本不需去雄D.用数理统计的方法对实验结果进行分析