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【单选题】
Which of the following topic lists best summarizes the main points of the selection?A． A．--Arts of Native American family --Invitation to White House --Brotherhood of Native American writersB.
--Native American background as topic for writing --Importance of attending White House poetry event --Vitality of contemporary Native American writing
C.
--Native American writing --Achievements of ancestors --Future of Native Americans
D.
--Writing in 1940s, 1950s, and 1960s --Involvement of Native Americans in many forms of art --Writing about Native American heritage
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举一反三
【单选题】下列哪项不是导致食物残渣在肠道停留时间延长，使老年人常常出现排便无力或便秘的原因？
A.
老年人结肠蠕动减弱
B.
肠道对扩张的感觉不敏感
C.
对肠内容物的压力感觉降低
D.
饮食不规则
【简答题】The circuit in Fig 2-3 can be simplified as：Fig（a）, Fig（b）, Fig（c）, Fig（d）. Choose （ ）.