题目

A motto is a sentence or a phrase which can inspire us especially when 61________ (face) with difficulties. Many of us have our mottoes, such as “Where there is a will, there is a way.” 62________ “Nothing is difficult if you put your heart into it.”, and so on. My motto is “God helps those 63________ help themselves.” Sometimes I am lazy and don’t want to make efforts 64________ (work) hard, but as soon as I think of my motto I will get energetic again and devote myself 65________ what I am doing. I write my motto where I can see 66________ easily. Every time I fail in m小麦的毛颖和光颖是一对相对性状（由基因P、p控制），抗锈病和感锈病是一对相对性状（由基因R、r控制），控制这两对相对性状的基因独立遗传。以纯种毛颖感锈病植株（甲）和纯种光颖抗锈病植株（乙）为亲本进行杂交，F1均为毛颖抗锈病（丙）。再用F1与丁进行杂交，F2有四种表现型，对每对相对性状的植株数目作出的统计结果如图所示，则丁的基因型是A.PprrB.PPRrC.PpRRD.ppRr