A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/cb4dd932-02b3-4b87-9206-781e96f8a0ee.gif"title="ex_1257489081406_0.gif"alt="ex_1257489081406_0.gif"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/49dda9b2-66eb-4291-9f4b-1a61bfa7230f.gif"title="ex_1257489096059_0.gif"alt="ex_1257489096059_0.gif"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/a483d6f2-72a1-4d17-aa9b-c0017b632a98.gif"title="ex_1257489108499_0.gif"alt="ex_1257489108499_0.gif"/>
D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/ef74d4f1-0f18-49b5-803c-a4e9b3b0df72.gif"title="ex_1257489120556_0.gif"alt="ex_1257489120556_0.gif"/>