第21题: [单项选择]慢性肺源性心脏病心力衰竭时．以下是右心扩大的体征的是（） A. 肝大 B. 双下肢水肿 C. P2>A2 D. 剑突下抬举样搏动 E. 双侧胸腔积液 参考答案:D 答案解析:慢性肺源性心脏病由于肺动脉高压导致右心负荷加重。引起右心扩大甚至右心衰竭，肝大、双下肢水肿、双侧胸腔积液为右心衰竭表现，P>A说明肺动脉压力增高，只有剑突下抬举样搏动反映右心扩大。
第25题: [简答题]In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. 参考答案:古往今来，男孩和女孩的玩具各不相同，因为在男女的任务分工业已固定化了的社会里，男孩往往模仿父亲的活动，而女孩则模仿母亲的任务。
