A、<img width="61" height="38" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/e75de3b0-cfda-461e-9626-3743a25a36ef.png" />
B、<img width="59" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dc733189-60be-4558-8684-30a5cda00d0f.png" />
C、<img width="68" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dde0bfbe-9c3a-4789-826c-b8e34c1c8d97.png" />
D、<img width="71" height="38" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/f4764261-a98e-47aa-95cf-1f564e337adb.png" />
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