题目内容

老年人容易发生传导障碍的主要原因是（）。

A. 心脏的顺应性下降
B. 心肌纤维逐渐发生脂褐质沉积
C. 窦房结内的起搏细胞数目减少
D. 希氏束和束支连接部束支纤维丧失
E. 心脏瓣膜由于硬化和纤维化而增厚

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关于跌倒的危险因素不包括（）。

A. 夜尿，每晚大于两次
B. 多数发生在室内
C. 定向不良或痴呆
D. 熟悉的居住环境
E. 高的老年抑郁数值

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A. 对
B. 错

There was basically no traditional foreign trade companies and manufacturing companies in e-commerce sector prior to 2012, and they began to set foot in this area in about 2013.

A. 对
B. 错

The making of policies aboutChinacross-border e-commerce falls into three stages: Early Stage (2004-2007); Development Stage (2008-2012); High-tide Stage (since2013).

A. 对
B. 错