现代互联网技术的广泛应用，催生了快递行业的高度发展，据调查，长沙市某家小型“大学生自主创业”的快递公司，今年三月份与五月份完成投递的快递总件数分别为10万件和12.1万件，现假定该公司每月投递的快递总件数的增长率相同．

先天愚型是一种遗传病，控制正常性状的基因为B，控制致病性状的基因为b．现有一对表兄妹，均表现正常，他们婚后生有一个先天愚型的孩子，据此回答：

他们三人的基因型是：父：____         母：____         孩子：____．

Dear Liza,

    I will be ten years old on Friday, 22nd July. To celebrate my birthday, I will invite several friends and I hope that all of you will be able to come to the party on that day.

    There will be two parts in my party. The first will be at the swimming pool near our school. Please bring your swimsuit (游泳衣) and a change of clothes. We have planned some pool games. My parents will be at the pool to protect the swimmers. The pool party will be from 2 to 3 p.m.

    The second part of the party will be at my house. A bus will take us all from the pool to my house. A singer is coming to my house. He will sing popular songs for us. I am sure you will enjoy them. The home party may last till 5 p.m.

    Please let me know by Friday, 15th July, whether you will come to my party, so that I will know how much food to prepare.

Love

Tracy

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