.

A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/1db6747b-3584-4470-b358-adbe664259a0.jpg"title="1374135526265.jpg" alt="1374135526265.jpg"/>

B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/db340d21-098b-4454-a80d-374ef12dce17.jpg"title="1374135541515.jpg" alt="1374135541515.jpg"/>

C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/a382416f-15fe-4516-b78a-d5254b40e0a6.jpg"title="1374135558468.jpg" alt="1374135558468.jpg"/>

D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/823c5a0a-de0f-4065-9a05-fa3a8d860d44.jpg"title="1374135573250.jpg" alt="1374135573250.jpg"/>