A、<img width="37" height="30" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/4d9c6175-76bb-4100-b3bb-e54ccf21f232.png" />
B、<img width="37" height="32" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/6a65c34a-2f8d-42dd-86ea-44ae111390de.png" />
C、<img width="37" height="25" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/d2dfe0e1-f301-418c-a1a2-d51e9a2c8b42.png" />
D、<img width="34" height="32" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/24343631-d8f5-4857-8969-b42f0936b8d2.png" />