某生物个体经减数分裂产生4种类型的配子，即Ab∶aB∶AB∶ab=4∶4∶1∶1，这个生物如果自交，其后代中出现隐性纯合体的比例是（   ）

增加：在缺词处加一个漏字符号（∧），并在此符号下面写出该加的词。

删除：把多余的词用斜线（＼）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1).每处错误及其修改均仅限一词；

2).只允许修改10处，多者（从第11处起）不计分。

    "Practice makes perfect" was an old saying.It tells us that it does not any matter if we are slow at doing something.As long as we keep on trying and practice,we'll do a good job at the end.The saying is especial useful in English study.Since a student is poor at speaking,he should catch every chance to open mouth and speak English.His oral English may be excellent one day as a result of his hard works.Not only is the saying useful in English study,but it is helpful in our daily life as well.To some degree,it is no easy way in doing everything since the key to succeed lies in "Practice makes perfect".

     When you're invited to have dinner in a restaurant in a western country, please remember: at table, when the hostess picks up her napkin, you may pick up yours and put it on your legs.

      If a servant passes food around, he will pass the dish to you at your left hand so that you can easily serve yourself with your right hand. Never serve yourself while the dish is on your right; it is the turn of your neighbor on the right. Do not reach across the table or in front of someone to get something that you want to eat. It is not polite. Ask him or her to pass it to you.

     There are things in the middle of the table, such as bread, butter, and candies. You shouldn't take any until the hostess tells the servant to pass them to you.

     Do not leave your seat without saying anything. If you need to leave the table to go to the washroom or do something else, you should say "Excuse me for a moment, please."

已知：如图△ABC的顶点坐标分别为A（-4，-3），B（0，-3），C（-2，1），如将B点向右平移2个单位后再向上平移4个单位到达B₁点，若设△ABC的面积为S₁，△AB₁C的面积为S₂，则S₁，S₂的大小关系为（　　）

下图是我国历史上一位重要的历史人物，李白称赞他说：“秦王扫六合，虎视何雄哉！” 李白称赞他的功绩是（     ）