有毒青蛙用刺眼的颜色表示自己是有毒的，而“欺骗性”物种则是在_爱下问搜题

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问题单项选择题

有毒青蛙用刺眼的颜色表示自己是有毒的，而“欺骗性”物种则是在没有毒素作为依托的情况下来模仿警告性着色。在厄瓜多尔的亚马逊热带雨林中所做的一项研究，获得了令人吃惊的发现：可以食用的青蛙的颜色会模仿附近两种有毒青蛙中毒性较小的一种，以获得100%的保护，它们会被学习区分毒性不同的青蛙的捕食者回避。以下哪项，作为结论从上述题干中推出最为恰当（）

A．当毒性极强时，会使捕食者回避与有毒目标稍微有点相像的东西，而毒性不是特别强时，捕食者的回避会变得有针对性

B．动物在长期的大自然生存斗争中，经过种系遗传，保存和发展生来具有自我保护功能，回避可能的危害是动物的自我保护系统中重要的一环

C．当毒性极强时，捕食者的回避会变得有针对性，而毒性不是特别强时，会使捕食者回避与有毒目标稍微有点相像的东西

D．模仿毒性不是特别强的青蛙要比模仿毒性强的青蛙要容易

答案

参考答案：A

解析：

题干中表述：可以食用的青蛙的颜色会模仿附近两种有毒青蛙中毒性较小的一种，以获得100%的保护。可以推出A项的结论：毒性不是特别强时，捕食者的回避会变得有针对性。C项观点与A项恰好相反，因此错误。而B项和D项没有涉及，不能推出。故选A。

单项选择题 A1/A2型题

胸部摄影条件选择的叙述，错误的是（）

A.FFD180～200cm

B.腹式深吸气后摒气曝光

C.自动曝光控制最短响应时间≤40ms

D.病人辐射体表入射剂量≤1.5mGy

E.高千伏摄影，滤线栅栅比选8：1

完形填空

More Than I Had Dreamed Of
From the time I was seven, I had a dream of becoming a member of the Students Union. I always 36  my school leaders for taking responsibility for all of us. So I dreamed of being a leader.
Years flew by, and soon I was able to participate in the elections,   37  I would win. But the reality struck that I hadn’t had a chance. I wasn’t pretty. Girls across the school hardly knew me. I just did not have what it   38  to win a school election. I was   39 .
As I cried in my room that evening, I   40  took a deep breath and decided I wouldn’t stop dreaming. I decided that I would   41  elections again in my final year at school—and I would win.
I recognized that my   42  had a lot of things in their favor. What were the   43  that would work in my favor? I had good grades, and I was friendly and helpful. And my biggest   44  was the faith I had. I would not allow my   45  appearance to hold me back from putting my best foot forward. That evening, I   46  my election plans a whole year in advance.
I realized that girls would have to get to know me and recognize that I had the ability to   47  them. I loved making friends and I liked being helpful,   48  I decided that perhaps I could use these qualities to work to my advantage. In order to learn how to present a great election   49 , I also attended a course on effective public speaking.
The day after the election, when the principal(校长) announced I won the second highest number of votes, the students   50 . That joy on the faces of all my friends showed me that my victory was    51  theirs.
Suddenly, I realized that I had   52  much more than I had dreamed of. I had made many new friends and had helped people   53  the way. I had won the   54  and love of my school-mates and they knew me as somebody who would stand by them. I was able to put a smile on their faces and    55  their day.
36-40BBACD  41-45BDACA    46-50CDBAB 51-55BCADD

C．calculating

B．immediately

C．impatiently

D．participate

A．companions	B．enemies
C．schoolmates	D．competitors

B．accelerated

C．accomplished

A．appointment