问题
单项选择题 A1/A2型题
寻常型天疱疮属于（）
A.速发型变态反应性疾病
B.自身免疫性疾病
C.自限性疾病
D.感染性疾病
E.免疫缺陷疾病
答案
参考答案：B
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寻常型天疱疮属于（）
A.速发型变态反应性疾病
B.自身免疫性疾病
C.自限性疾病
D.感染性疾病
E.免疫缺陷疾病
参考答案：B
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| In the past all letters were sent by train or ship. Now most letters are __1__ sent by train or ship, but some are sent by air. You send a letter __2__ so that your friend may receive it sooner. A letter __3__ about twelve days to go from England to India by train or by ship. A letter can get to India by air __4__ five days now, but __5__ the time may be made shorter. __6__ people were afraid to send letters by air. They thought that the plane might fall and their friends might not receive the letter. So they sent two letters: one letter by air and __7__ by train or ship. They wanted to __8__ that the letters would be received. Planes are now almost as safe __9__ trains or ships. __10__ letters are sent by air, | ||||
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