下列属于屏障系统动物的是（） A.无菌动物 B.悉生动物 C.常规动物 D.清洁动物
题型：单项选择题 A1/A2型题
问题：
下列属于屏障系统动物的是（）
A.无菌动物
B.悉生动物
C.常规动物
D.清洁动物
E.无特殊病原体动物
题型：单项选择题 A1/A2型题
I often write about the bad state of television these days, but recently my mom told me about a story she saw on 60 Minutes that was inspiring, educational, and entertaining for the who
le family. I went to the show’s website to see for myself. My mom was right. At a time when even Barbara Walters says she’s really bored with celebrities interviews, this one will not disappoint.
It’s the story of Derek Paravicini, a 30-year-old who was born three months early, physically disabled (he can’t button his own shirt), blind, and severely autistic(自闭的).
Yet, through total luck and coincidence, his family discovered that Derek had a remarkable musical talent when he was three.
Derek can hear any musical composition one time and play it perfectly on the piano.
That’s right. He only has to hear it once.
Even more unbelievable, his brain, like a computer, can keep many songs that he can immediately repeat when asked. But 
his talent isn’t limited to just learning things by heart. Derek is a true musical genius and artist who plays beautifully in a wide range of styles and can make his own music.
With his talent, Derek has raised millions of dollars putting on charity concerts. He also donates his time to senior centers where he acts as a human jukebox (自动唱机) machine, taking requests from senior citizens who haven’t heard their favorite songs for decades.
As it turns out, Derek loves people and his extraordinary talent has been the key to unlocking his personality and social development.
If you want to inspire your family, pop some popcorn and sit everyone down to watch this excellent piece of journalism. If your kids are like mine, it will cause a great family discussion about the definition of “disability” and the extraordinary ability of the human brain and spirit. It may even give you the perfect answer the next time your child says he or she “can’t” do something. Now that’s priceless.
Who says there’s nothing good on TV?
小题1: From the first paragraph, we know that 60 minutes is a TV program on .
A．interviewing celebrities
B．interviewing the disabled
C．the latest news round the world
D．stating the positive influence of TV小题2: How does Derek help the elderly?
A．By buying them a jukebox machine.
B．By building senior centers for them.
C．By singing the old songs they ask for.
D．By playing the piano to raise money for them.小题3: In the opinion of the author, Derek can .
A．attract the whole family to watch TV together
B．cause family members to help the disabled
C．help kids understand the ability of their brains
D．encourage kids to accept challenges in life小题4:The author’s purpose in writing this passage is to .
A．prove that there is something good on TV
B．introduce a disabled but gifted musician
C．call on people to show more love to the disabled
D．express personal admiration for Derek Paravicini