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问题 单项选择题

急性心肌梗死合并急性病态窦房结综合征常见原因是（）

A.右冠状动脉病变

B.左冠状动脉主干病变

C.左冠状动脉前壁支

D.左冠状动脉回旋支

E.以上都不是

答案

参考答案：A

写句子

句子转换。 

1．和田维吾尔人热爱土地的程度令人惊叹。  

     感叹句：                                                                                                                                           

2．一位解放军战士划着了一根火柴。    

   “把”字句：                                                                                                                                     

   “被”字句：                                                                                                                                      

3．我们经常在教室里讨论数学题。（改变词序，但意思不变） 

                                                                                                                                                         

4．北风卷着大雪在空中飞舞。 

     改为比喻句：                                                                                                                               

5．水流从几丈高的悬崖上泻下来，飞溅起阵阵白雾。

     改为夸张句：                                                                                                                                

6．蜜蜂在花丛中忙着采蜜。 

     改为拟人句：                                                                                                                                

7．我不能不被他的精神所感动。

     改为肯定句：                                                                                                                                

8．他，是生活的强者。

     改为否定句：                                                                                                                                

9．这件事你应该办好。

     改为双重否定句：                                                                                                                        

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解答题

已知函数f(x)＝ax2－(4a＋2)x＋4lnx，其中a≥0．

（1）若a＝0，求曲线y＝f(x)在点(1，f(1))处的切线方程；

（2）讨论函数f(x)的单调性．
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