A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/3b913b63-9e37-4612-a387-1d5b81605b28.png"title="ex_1397181160000_0.png" alt="ex_1397181160000_0.png"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/05311892-68ac-4b03-9408-2eb0344459aa.png"title="ex_1397181185459_0.png" alt="ex_1397181185459_0.png"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/580c836d-712d-499c-bbe8-bfac6528f191.png"title="ex_1397181206490_0.png" alt="ex_1397181206490_0.png"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e7c4c9f2-499c-46c2-9f6c-24302f1501ab.png"title="ex_1397181228283_0.png" alt="ex_1397181228283_0.png"/>