A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/a6e78d76-960a-4f1d-a9bc-12c577b4d436.jpg"title="1373956213812.jpg" alt="1373956213812.jpg"/>

B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/28287327-b7aa-436c-87ab-e27ead8efe79.jpg"title="1373956220578.jpg" alt="1373956220578.jpg"/>

C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e3735f93-0bca-4b5c-ba45-7d1f6970bea4.jpg"title="1373956228187.jpg" alt="1373956228187.jpg"/>

D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/710d652f-0e55-4a96-a8ed-3c9006ea9f88.jpg"title="1373956203234.jpg" alt="1373956203234.jpg"/>