A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/35a3717a-3ca4-4152-81bc-0cab64fe6539.jpg"title="image50.jpg" alt="image50.jpg"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/3960c458-61dc-4afa-a9c1-ed428fb5c721.jpg"title="image51.jpg" alt="image51.jpg"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/b08bd942-f289-4713-9e2e-6330efa16fbb.jpg"title="image52.jpg" alt="image52.jpg"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/d9eda8c5-be05-4304-8a6c-4c358caa2133.jpg"title="image53.jpg" alt="image53.jpg"/>