A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/3ca8ff50-dcd9-492c-a130-2bd42ad0044a.gif"title="ex_1257306300501_0.gif" alt="ex_1257306300501_0.gif"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/f17a34bd-c8cc-4e5d-835b-d1dff4b3092c.gif"title="ex_1257306312570_0.gif" alt="ex_1257306312570_0.gif"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/45c938d6-f524-4c98-8c67-ad4c8beafa90.gif"title="ex_1257306353992_0.gif" alt="ex_1257306353992_0.gif"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/a1aa59a3-8cdf-47aa-a471-64c97d7c47ab.gif"title="ex_1257306363179_0.gif" alt="ex_1257306363179_0.gif"/>