A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/8640764b-67e7-40b4-a974-fcdf7c5a5034.jpg"title="image49.jpg" alt="image49.jpg"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/ca65396f-b91a-4cb4-8323-92a6f6cff990.jpg"title="image50.jpg" alt="image50.jpg"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/d56d79c7-b784-4945-977e-c83e5ba4d291.jpg"title="image51.jpg" alt="image51.jpg"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/5a5051b5-ac62-4963-973a-92eb3bea0e08.jpg"title="image52.jpg" alt="image52.jpg"/>