我们有时候会看见鸡在吃砂子，问鸡吃砂子的原因是什么？

发布时间：2017-05-09 19:49 │ 来源：www.tikuol.com

题型：问答题简答题

问题：

我们有时候会看见鸡在吃砂子，问鸡吃砂子的原因是什么？

考点：自然科学知识竞赛生物知识竞赛生物知识竞赛题库

题型：问答题简答题

往复泵与离心泵相比，缺点是（）。

A．扬程低

B．没有自吸能力

C．流量与排出压力无关

D．流量不均匀

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题型：问答题简答题

患者，女，23岁。高热、衰竭伴腹胀10天。肝肋下5cm，质中，轻压痛，脾肋下8cm。血红蛋白85g／L，白细胞2．4×10⁹／L，血小板80×10⁹／L。骨髓中可见多形异常组织细胞及多核巨组织细胞，占16％，有吞噬血细胞的组织细胞。NAP降低，血清AFP（-），肥达反应（-）。本例最可能诊断（）

A.粒细胞缺乏症

B.急性白血病

C.骨髓转移癌

D.反应性组织细胞增多症

E.恶性组织细胞病

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题型：问答题简答题

     It was in my high school science class. I was doing a task in front of the classroom with my favorite
shirt on.
     A__1__ came, "Nice shirt," I smiled from ear to ear. Then another voice said, "That shirt belonged
to my dad. Greg's mother works for my family. We were going to__2__ that shirt away,  but gave it to
her__3__." I was speechless. I wanted to hide.
     I__4__ the shirt in the back of the closet and told my mom what had happened. She then dialed her
__5__,  "I will no longer work for your family," she told him. That night,  mom told my dad that she
couldn't clean anymore; she knew her life's__6__ was something greater.
     The next morning she__7__ with the personal manager at the Board of Education. He told her that
without a proper education she could not teach. So mom decided to__8__ a university.
     After the first year in college,  she went back to the personal manager. He said, "You are__9__,
aren't you? I think I have a__10__ for you as a teacher's assistant. This opportunity deals with children
who are mentally challenged with little or no chance of__11__." Mom accepted the opportunity very
__12__.
     For almost five years,  as a teacher's assistant, she saw teacher after teacher give up on the children
and quit,  feeling__13__. Then one day, the personal manager and the principal__14__ in her classroom.
The principal said, "We have watched how you__15__ the children and how they communicate with you
and admire your hardworking__16__ over the last five years. We are all in agreement that you__17__ be
the teacher of this class."
     My mom spent more than 20 years there. __18__ her career, she was voted Teacher of the Year. All
of this came about because of the__19__ comment made in the classroom that day. Mom showed me
how to handle__20__ situations and never give up.

( )1. A. noise
( )2. A. get
( )3. A. otherwise
( )4. A. settled
( )5. A. teacher
( )6. A. purpose
( )7. A. went
( )8. A. visit
( )9. A. serious
( )10. A. career
( )11. A. learning
( )12. A. patiently
( )13. A. upset
( )14. A. looked up
( )15. A. believe
( )16. A. spirit
( )17. A. must
( )18. A. At
( )19. A. worthless
( )20. A. challenging

B. voice
B. take
B. anyhow
B. pushed
B. employer
B. encouragement
B. met
B. continue
B. fortunate
B. duty
B. judging
B. eagerly
B. frightened
B. went up
B. protect
B. intention
B. would
B. During
B. thoughtless
B. different

C. sound
C. carry
C. instead
C. made
C. director
C. achievement
C. worked
C. attend
C. careful
C. position
C. obeying
C. successfully
C. guilty
C. took up
C. treat
C. action
C. might
C. On
C. hopeless
C. dangerous

D. tune
D. throw
D. actually
D. stuck
D. adviser
D. victory
D. stayed
D. prepare
D. responsible
D. part
D. imagining
D. skillfully
D. ashamed
D. showed up
D. receive
D. attempt
D. should
D. With
D. helpless
D. strange

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题型：问答题简答题

目前有三项被公认为世界三大环境问题，下列哪项不属于该三大环境问题 [ ]

A．酸雨

B．臭氧层破坏

C．水污染

D．温室效应

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题型：问答题简答题

回忆偏倚与报告偏倚的区别在于（）

A.回忆偏倚是研究对象故意不回忆真实情况造成，报告偏倚是研究对象故意不报告真实情况造成

B.回忆偏倚在病例对照研究中最常见，报告偏倚在队列研究中最常见

C.回忆偏倚在病例对照研究中最常见，报告偏倚在干预研究中最常见

D.回忆偏倚是研究对象不能准确、完整地回忆以往发生的事情和经历时所产生；报告偏倚是研究对象有意扩大或缩小某些信息造成的偏倚

E.回忆偏倚是由于调查的事件发生率较低，未留下深刻的印象，研究对象不能很好的回忆起来，而报告偏倚是因为调查事件发生很久，记忆不清，没有报告

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