胃的癌前病变和癌前疾病不包括（）
A.胃黏膜上皮的非典型增生
B.慢性胃溃疡
C.慢性肥厚性胃炎
D.B型慢性萎缩性胃炎
E.胃的急性应激性溃疡
参考答案：E
解析：癌前病变是指一些易发生癌的病变，如胃黏膜上皮的非典型增生等；癌前疾病是指有可能继发胃癌的独立性胃疾病，如慢性萎缩性胃炎、慢性肥厚性胃炎、胃溃疡等。应激性溃疡指位于胃十二指肠的急性表浅性黏膜糜烂和溃疡。常继发于休克、烧伤、创伤、手术及败血症等，不发生癌变。
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| Mobile phones are everywhere in big cities. It seems that 1 can survive without one. Mobile phones are a great 2 to stay connected with friends and family. 3 , it is important to remember that there are certain times 4 you should not be using your phone, especially as a student, during school. 5 you are in class, you should not be sending your friends text messages 6 taking phone calls. Your classmates and teacher should not have to deal with this rude 7 . Aren't you at school to learn? In the United States, students would never be allowed to 8 their mobile phones during class. If you were to send or 9 a text message you would probably be kicked 10 class. It is very disturbing to hear a lot of tones and ringing during 11 . There are many more rules for mobile phone use in America and it is important to 12 respect for those around you. As a teacher in China, I have to 13 students using mobile phones every day. I have told my class to 14 their phones, but many students do not listen. The 15 to be connected all the time seems to be more 16 than the desire to learn. It's easy to understand 17 it is so tempting (诱惑人的) to have your phone on during class. It seems so easy just to send a short text message; it's not hurting anyone, is it? But you may actually be hurting 18 when you do this. Your teacher knows when you use your phone and may give you a 19 grade. Sending a text message also takes your attention away from what's going on in class, you may 20 something important. | ||||
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