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请阅读Passage l。完成第21—25小题。
Passage 1
It's one of our common beliefs that mice are afraid of cats. Scientists have long known that even if a mouse has never seen a cat before, it is still able to detect chemical signals released from it and run away in fear. This has always been thought to be something that is hard-wired into a mouse s brain.
But now Wendy Ingram, a graduate student at the University of California, Berkeley, has challenged this common sense. She has found a way to"cure" mice of their inborn fear of cats by infecting them with a parasite, reported the science journal Nature.
The parasite, called Toxoplasma gondii, might sound unfamiliar to you, but the shocking fact is that up to one-third of people around the world are infected by it. This parasite can cause different diseases among humans, especially pregnant women--it is linked to blindness and the death of unborn babies.
However, the parasite's effects on mice are unique. Ingram and her team measured how mice reacted to a cat's urine(尿) before and after it was infected by the parasite. They noted that normal mice stayed far away from the urine while mice that were infected with the parasite walked freely around the test area.
But that's not all. The parasite was found to be more powerful than originally thought—even after researchers cured the mice of the infection. They no longer reacted with fear to a cat's smell,which could indicate that the infection has caused a permanent change in mice's brains.
Why does a parasite change a mouse's brain instead of making it sick like it does to humans?
The answer lies in evolution.
"It's exciting scary to know how a parasite can manipulate a mouse's brain this way," Ingram said. But she also finds it inspiring."Typically if you have a bacterial infection, you go to a doctor and take antibiotics and the infection is cleared and you expect all the symptoms to also go away."
She said, but this study
根据文章第四段“They noted that normal mice stayed far away from the urine while mice that were infected with the parasite Walked freely around the test area．”可知，受到寄生虫感染的老鼠能够自由随意地在测试区域周围走动．故选B。
教师职业道德区别于其他职业道德的显著标志就是（ ）。
教师在直观教学时，应用“变式”方法的目的在于（ ）。
《普通高中数学课程标准(实验)》提出五种基本能力，没有包含在其中的是
在教学过程中，教师指导学生体验客观事物的真善美的方法是（ ）。
在学校教育依照特定教学目标组织教学的过程中，起关键作用的是( )。
被毛泽东主席誉为“一代天骄”的成吉思汗（ ）
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简述学习动机的分类。
简述学生心理发展的基本特征。
在教育史上主张“不愤不启，不悱不发”的教育家是（）。
