A、<img border="0" width="23" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/798abac6-f5ad-4dca-bde7-1b88a5097bdd.png" />
B、<img border="0" width="24" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/1618f7df-d6b0-4a9f-ad69-c31dc555b37e.png" />
C、<img border="0" width="23" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/ceb9d946-4206-4eed-8c4c-39a204e521d1.png" />
D、<img border="0" width="24" height="41" src="http://admintk.100xuexi.com/UpLoadImage/2016-09-29/805e2ef3-d247-4894-9347-9783116344a9.png" />