题目

完形填空 Setting of fireworks during festivals is said to have a history of about 2000 years. It does add to festive atmosphere. But let's stop and 1 the price we pay for just a few minutes of 2First, the amount of money we spend on fireworks is 3 .The excitement is gone 4 . Let's face it, what we really are doing is burning 5 . Those tax dollars would be 6 to much better use. Second, there is the matter of7 .Fireworks contain chemicals that are harmful to people and animals. Over the years, these chemicals will8 the air we breathe and the water we drink. Third, let's consider the rub（10分）果蝇是研究遗传学的好材料。据图及所学知识回答下列问题： （1）此图是＿＿＿＿性果蝇体细胞染色体组成示意图，其中含有＿＿＿＿对同源染色体，若只研究基因A与a的遗传方式，应该符合基因的＿＿＿＿定律。 （2）果蝇红眼对白眼是显性，相关基因B、b位于X染色体上，现让一红眼雌果蝇与一白眼雄果蝇交配，F1代中雌雄果蝇均为一半红眼，一半白眼。请你用交叉线法画出遗传图解： P： 配子： F1：