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问题 单项选择题

病灶呈类圆形，位于鞍上，在MRI的T1和T2加权像上均呈高信号，垂体受压变扁（）

A.蛛网膜囊肿

B.Rathke囊肿

C.囊性颅咽管瘤

D.胶样囊肿

E.囊性垂体瘤

答案

参考答案：C

实验题

小阳和小华两位同学各自进行“测定小灯泡电功率”的实验。实验中使用的小灯泡上标有“2.5V”字样，滑动变阻器上标有“20Ω  2A”字样。

（1）小阳连接的电路如图所示，实验步骤正确，闭合开关后，发现小灯泡发光较暗，电流表、电压表的示数如图所示，则他所用的电源电压为       V。接着他移动滑动变阻器的滑片P，当观察到电压表的示数为2.5V时，此时滑动变阻器的滑片恰好在中点上，小灯泡正常发光时的功率为           W。

  

（2）小华正确连接了电路，闭合开关，移动滑动变阻器的滑片P，观察到小灯泡始终不亮，电压表有示数，电流表的示数为零。若电路中只存在一处故障，则故障可能是                              。
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改错题

短文改错。

  As the world enters the 21st century , the development in the science and technology will bring us

much more new hopes and chances we've never imagined before .People are hoping have a peacefully

and highly developed world .To catch up with the new development and to be success in the new

century, the younger generation is required to have different kind of skills and abilities ,such like the

computer science and the English language .Otherwise one will be leaving behind .Young people

should study even hard at school and prepare themselves mentally and physically to meet with the

challenge of the new century .

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