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【单选题】
下列关于变异的叙述，正确的是 [ ]A.
染色体中缺失一个基因不属于基因突变
B.
产前诊断能确定胎儿性别进而有效预防白化病
C.
染色体变异和基因突变均可以用光学显微镜直接观察
D.
秋水仙素诱导多倍体形成的原因是促进染色单体分离使染色体增倍
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【单选题】某公司财务部以前每天平均有700万元的应收款，公司特意为他们开设了一门培训课程，教他们如何更有效地追讨欠款。培训后评估发现财务部每天的应收款项下降到每天平均300 万元，取得了较好的培训效果。请问公司是用哪一个指标对此次培训课程的效果进行评估的? ( )
A.
反映
B.
学习
C.
行为
D.
成果
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A.
正确
B.
错误
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