_________（50）A.it can be a sign of respectB.they
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_________（50）
A.it can be a sign of respect
B.they become more intimate
C.We assume these actions are occasional
D.Americans are careful about how and when they meet one another’s eyes
E.who are engaged in the study of communication through body movement
F.they do not mean that
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答案：A
空白处后面是两个用分号连接、语法结构相同的排比句，由此我们推测空白处应当跟后面两个句子的结构相似，选项中只有A合适，本句的意思是：当一个学生在同教授谈话时比平时更久地看着这位年长者的眼睛，这就可能是尊敬的表现。