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问题 填空题

图1为某家族两种单基因遗传病的系谱图(这两种遗传病分别由位于常染色体上的基因A/a及X染色体上的基因B/b控制)，图2表示5号个体生殖腺中某个细胞的连续分裂示意图。请回答：

子细胞中染色体数目的减半是通过图2的（）(填图中数字)过程实现的。若细胞e1和e2的基因组成并不完全相同，其原因可能是发生了（）。

答案

参考答案：② 基因突变(或交叉互换)

阅读理解
阅读理解。
以下四个方框中的内容是四位中学生向某报编辑诉说的烦恼，下边四个方框中的内容是编辑提供给她们的建议。请将它们一一配对。
( )1. My parents never allow me to play computer games at all. They want me to study all day and do
           well in my  exams. I feel unhappy.
( )2. I found that my mother read my dairy when I was out. I don't think anyone, even my parents,
           has the right to read  my diary. Now I feel hurt and sad.
(      )3. Sometimes I get angry easily and shout at my friends. That makes them think I'm not being
            friendly to them.
( )4. One of my classmates gave me a nickname. I really don't like it because I think he laughs at me.  
            I feel sad.
A. When you feel angry, you should stop talking and count to ten or walk away until  you keep quiet.
B. He doesn't mean to hurt you. Each time he calls you that, tell him politely you don't like it. I'm sure
     he will not call you in that way any more.
C. You need to sit down and really talk to your mother about this. Don't get angry. Use calm, clear 
     words to explain. Tell them that you are old enough to have more privacy ( 隐私).
D. Tell your parents that many kids play computer games and do well at school, too. Ask them to allow
     you to play for a short  time on weekends.
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多项选择题

行政复议机关作出维持决定需要符合条件（）。

A.具体行政行为认定的事实清楚

B.具体行政行为的证据确凿

C.作出具体行政行为适用的依据正确

D.作出具体行政行为的程序合法
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