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问题 单项选择题

关于第一心音和第二心音的判定，错误的是（）

A.S1音调较S2低

B.S1至S2的距离较S2至下一心搏S1的距离短

C.桡动脉的向外搏动与S1同步或几乎同步

D.S2在心底部较响

E.S1时限较S2长

答案

参考答案：C

选择题

某先天性心脏病患者的心脏左右两部分未完全隔开，其口唇和面部等处经常发紫，其原因是（　　）

A．主动脉输出的血液中混有不少静脉血，导致组织细胞供氧不足

B．肺动脉输出的血液中混有不少静脉血，导致组织细胞供氧不足

C．主动脉输出的血液中混有不少动脉血，导致组织细胞供氧不足

D．肺动脉输出的血液中混有不少动脉血，导致组织细胞供氧不足
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     If you want to    5    extra precautions(预防) and buy a filter mask, go to your local drug store.
Your Chinese friends may    6    you to take Banlangen, a traditional Chinese medicine widely    7   
in China to activate the immune(免疫的) system, or fumigate vinegar in your house to    8    viruses
(病毒) in the    9   , but "these measures are of no use in    10   the disease", said Dr. Qi Xiaoqiu,
Director General of the Department of Diseases Control, Ministry of Health.
      If you have    11   returned from Hong Kong or areas    12   SARS has been active, go to your
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until fully    15   . If you pass 12 days symptom-free after coming back from these areas, you    16  
set your mind at ease(无忧无虑).
     The following are some preventive measures you can take    17   by experts from the Chinese
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●Wash hands with running water after sneezing, coughing or clearing your nose;
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