A、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/ef532718-2aa8-11ea-8470-107b44152a3b.jpg">
B、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/ef86304a-2aa8-11ea-83c0-107b44152a3b.jpg">
C、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/efb51ba2-2aa8-11ea-8a20-107b44152a3b.jpg">
D、<img src="https://s3.cn-north-1.amazonaws.com.cn/s3.qsxt.info/course/201912/gjkfdx/efe499e6-2aa8-11ea-984e-107b44152a3b.jpg">
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