箭头所指的解剖结构是（）
A.右下肺静脉
B.右下肺动脉
C.右上肺静脉
D.右上肺动脉
E.奇静脉
参考答案：A
----I can’t make myself _______ in English
----Don’t lose heart. You are sure to make others ____ you in English if you keep on studying it.
A．understood; understanding
B．understood ; understood
C．understanding; understood
D．understood; understand
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