为什么科学家要用动物进行科学实验?

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问题:

为什么科学家要用动物进行科学实验?

考点:教育学科学素质纲要科学素质纲要题库
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Job Opportunities 
1.Full time secretary position(职位).Applicants(申请者)should have  at least 2 years’ experience and be able to type 60 words in a minute. No computer skills required. Apply in person at United Business Ltd,17Browning  Street, Leeds.
2.Computer Trained secretaries: Do you have experience working with computers? Would you like a full time position working in an exciting new company? If you want to know more about us, call at 0459-7986754.
3. Weekend work available: We are looking for retired people who would like to work part time on weekends for Rubber Last Group Ltd. Duties include answering the telephone and giving customers’ information. For more information call us at 0113-674126.
4. Teaching assistants needed: Hania’s Playschool need 2 young teaching assistants to help with history classes from 9 am to 3 pm. Applicants should have references. For more information please visit www.haniaplayschool.co.uk.
小题1:Which position is most suitable for a 60-year –old man?
A.Full time secretary
B.Weekend work in Rubber Last Group Ltd
C.Teaching assistants in Hania’s Playschool
D.Computer Trained secretaries
小题2:If you are good at computer and just graduated from university (History degree),   which jobs can you apply for?
A.Job 1and2B.Job 2and 3 C.Job 2 and4D.Job 1 and 3
小题3: How can you get more information if you are interested in the position of a   full-time     secretary position?
A.By telephone. B.In personC.By Internet.D.By letter
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在“用电流表、电压表小灯泡测电阻”的实验中,滑动变阻器不能起到的作用是(  )

A.改变电路中的电流

B.改变被测电阻的阻值

C.改变被测电阻两端的电压

D.保护电路

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蓄电池电池槽与电池之间采用()层封口剂封口。

A、3

B、双

C、单

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细胞培养中碳酸氢钠的作用是()。

A.提供缓冲系统,调节pH值

B.作为细胞分散剂

C.起抑菌作用

D.提供必要的营养

E.作为洗液用

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HLR保存了GPRS用户信息和路由数据。()

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