雄鸡为ZZ，雌鸡为ZW，缺少染色体Z会致死。环境的影响使一只ZW的小鸡发育成能正常交配的公鸡，该公鸡与正常母鸡交配,后代性别为（    ）

邓小平指出“必须加强法制建设，必须使民主制度化、法律化，使这种制度和法律不因领导人的改变而改变，不因领导人的看法和注意力的改变而改变。”这句话主要说明（    ）

根据短文内容，选择正确答案。

                                                                                               A

    The most popular food in America was invented because a cook got angry. George Crum was a cook at a restaurant in Saratoga Springs, New York. One day in 1853, a customer(顾客) who had ordered fried(油炸的) potatoes sent them back to the kitchen. He wanted the cook to slice(切) them thinner and fry them longer. George Crum had a bad temper(脾气), and he thought the potatoes were fine the way he made them. To teach the customer a lesson, he sliced potatoes very thin and fried them until they were crispy(脆的). But instead of being angry, the customer loved the new fried potatoes. He asked for more. Other people who tried them like them too, and customers kept asking for them. Far many years, people called them Saratoga chips after the town where they were first made.

    Even now, after more than 150 years, potato chips are very popular. At least one of every ten potatoes grown in the United States is made into potato chips. So if you like potato chips, be glad George Crum had a bad temper!

沙尘暴也称沙暴或尘暴，指的是强风将地面尘沙吹起使空气很混浊，水平能见度小于1公里的天气现象。中国西北地区是沙尘暴高发区之一，近年来，我国西北地区沙尘暴呈加重趋势，并危及到我国北方大部分地区。