根据题意可知：S△AOB=12|k|=2，所以k=±4．
故答案为：±4．
A group of frogs were travelling through the woods, and two of them fell into a deep pit(坑). When the other frogs saw how deep the pit was, they told the two frogs that they were as good 小题1: dead. The two frogs didn't listen to the others and tried to jump out of the pit with all小题2: might The other frogs kept 小题3: (tell) them to stop. Finally, one of the frogs heard what the other frogs were saying and gave 小题4: , so he died.
The other frog went on jumping as hard as he 小题5:. Once again, the other frogs cried at him and told him to stop and just allow himself to die. He jumped even 小题6: and 小题7: (final) made himself out. When he got out, the other frogs said, "Didn't you hear us?" The frog explained to them that something was wrong with his hearing. He thought they 小题8: (encourage) him the whole time.
There is power of life and death in the tongue. An encouraging word to someone 小题9: is down can lift him or her up and help them make it through the day. Be careful of 小题10: you say. Speak life to those who cross your path. The power of words — anyone can speak bad words that rob another of the spirit to go on in difficult times. But an encouraging word can go such a long way.
证券经纪业务中，资金账户挂失补办时，经办人需查验客户所提供的相关资料、有效身份证明文件与本人的（）。
A.一致性
B.真实性
C.合法性
D.准确性
