A、<img width="57" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/95edb4e4-4ddf-427a-83df-4b567449da4d.png" />
B、<img width="60" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/ef0a7d1f-71be-423f-bea3-927f2656ce4b.png" />
C、<img width="61" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/0632d3e7-7451-47d6-81b4-347b378fa0d5.png" />
D、<img width="61" height="21" src="http://admintk.100xuexi.com/UpLoadImage/2016-10-26/7de829ed-2687-498b-9565-944dc6325e4d.png" />
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