2014年4月20日，中国将迎来全功能接入国际互联网20周年。2014年4月20日。“中国全功能接入国际互联网20周年纪念会”在k举行。工业和信息化部副部长尚冰在致辞中指出，20年来，在政府、产业和社会各界共同努力下，我国互联网实现了从无到有，从小到大的健康持续发展，成为战略性新兴产业的重要领域，成为优化经济结构、转变增长方式、推动社会发展、促进改革开放的基础支撑和重要途径。

有科学家在实验室里实现了“将人体的卵细胞培育成囊胚”的实验，则在以下推测中，有可能正确的是(　　)
①如果该囊胚真能发育成成体，则其遗传特性和母本完全相同
②如果该囊胚真能发育成成体，其性别是男性的概率为1/2
③如果使囊胚的染色体数目加倍，得到的将是一个纯合的二倍体
④如果该囊胚真能发育成成体，该个体患遗传病的概率会大大增加

以下是测定菜油密度的实验步骤：（1）用天平测出空矿泉水瓶的质量m；（2）在矿泉水瓶中装满水，用天平测出总质量m₁；（3）在矿泉水瓶中装满菜油，用天平测出总质量m₂；（4）将菜油全部倒入量筒中，用量筒测出矿泉水瓶里所盛菜油的体积V₁；（5）将菜油倒入量筒中，测出剩余菜油和瓶的总质量m₃；（6）读出量筒中所盛菜油的体积V₂；（7）计算菜籽油的密度．有三个实验小组分别选用其中部分实验步骤测量出菜油的密度，并写出表达式：（ρ_水已知）①ρ= $\frac{m_2-m}{v_1}$ ②ρ= $\frac{m_2-m_3}{v_2}$ ③ρ= $\frac{m_2-m}{m_1-m}$ ，你认为较合理且误差较小的表达式是（   ）

Look! The people ____ (swim) in the lake now.

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    In our life, we meet quite a lot of people: some just pass by while others can 1 our lives. Miss Bella is such a person. She taught me two years only. 2, she has taught me a lot in many ways.

    Every day she began her classes with a smile and a fresh face. She made me realize that warm3 could change a person. I was shy but I wasn't 4 in her classes at all. She gave lessons in a 5 way from other teachers. We had many 6 to talk about problems in English classes. Miss Bella would thumb up (竖起大拇指) to encourage us 7 someone had great ideas. Now, I 8 that I have learned much from her classes. Learning to speak out your ideas is so9 in society. She also made me realize that I could be myself by showing opinions10. Her encouragement not only turned me into a confident student, but will also lead me to a successful life.