问题
单项选择题
脑栓塞的栓子最常见的来源是（）
A.心脏瓣膜赘生物或左心房附壁血栓
B.脂肪栓子
C.空气栓子
D.肺静脉血栓
E.下肢静脉血栓
答案
参考答案：A
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脑栓塞的栓子最常见的来源是（）
A.心脏瓣膜赘生物或左心房附壁血栓
B.脂肪栓子
C.空气栓子
D.肺静脉血栓
E.下肢静脉血栓
参考答案：A
England was one of the first countries to set aside a day to recognize mothers．In the eighteenth century, many people worked as household servants for the , "Mothering Sunday" was _ for them to return home to be with their mothers．Though this stopped when the Industrial Revolution altered the working and living patterns of people, one for mothers was established as a holiday in the twentieth century． In the United States, Mother's Day did not become a（n） holiday until 1915．Its establishment was due to the perseverance and love of one , Anna Jarvis．Anna's mother had provided strength and support as the family their home in West Virginia and Philadelphia, Pennsylvania her father served as a minister． When Mrs Jarvis died on May 5, 1905, Anna was determined to her．She asked a minister at the church in West Virginia to give a sermon（布道） memory of her mother． On the same Sunday in Philadelphia, ministers there honoured Mrs.Jarvis and all mothers with a (n) Mother's Day service．Anna Jarvis began writing to congressmen, asking them to a day to honour mothers. In 1910, the governor of West Virginia proclaimed(宣布) the second Sunday in May as Mother's Day and a year later every state it． On Mother' s Day morning some American children the tradition of serving their mothers breakfast in bed．Other children will give their mothers which they have made themselves or bought in ．Adults give their mothers red carnations, the official Mother's Day flower．If their mothers , they may bring white carnations to their grave（坟墓）sites．This is the busiest day of the year for American ．On the special day, family members do not want Mom to cook dinner!
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