A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/0df11019-f19e-4330-a66d-a1ddc0a298a0.png"title="ex_1397096751375_0.png" alt="ex_1397096751375_0.png"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/b0dc91f6-13b2-46c7-8e31-5431906e515f.png"title="ex_1397096335313_0.png" alt="ex_1397096335313_0.png"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/2c7d521a-c4be-4c3e-8af1-d0373553d010.png"title="ex_1397096555216_0.png" alt="ex_1397096555216_0.png"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e588ff5f-108e-47c5-b0fb-4c9af516ba6a.png"title="ex_1397096574133_0.png" alt="ex_1397096574133_0.png"/>