A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/65c7917d-f37d-46a6-a145-d15016e27a36.png"title="ex_1397115685672_0.png" alt="ex_1397115685672_0.png"/>
B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/22501773-ac4b-4bba-ab87-765af7e4a42b.png"title="ex_1397115737185_0.png" alt="ex_1397115737185_0.png"/>
C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/e343a6ca-3284-47c4-b53b-0f74f525ea6b.png"title="ex_1397115775559_0.png" alt="ex_1397115775559_0.png"/>
D、不确定的