A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e491ecb9-265d-46fc-8af0-5f5327de0d7e.png"title="ex_1397095917695_0.png" alt="ex_1397095917695_0.png"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/2c315a7a-e966-42a0-b16d-83a2b077a76b.png"title="ex_1397095958481_0.png" alt="ex_1397095958481_0.png"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/2a239fa6-22bd-4658-8325-6dd11ff0b72e.png"title="ex_1397095991928_0.png" alt="ex_1397095991928_0.png"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e16e9a40-eaa1-4f4e-8432-d002e61de705.png"title="ex_1397096020241_0.png" alt="ex_1397096020241_0.png"/>