问题
单项选择题
恶病质素主要由哪种细胞产生（）。
A.T细胞
B.B细胞
C.中性粒细胞
D.树突状细胞
E.单核巨噬细胞
答案
参考答案：E
解析：肿瘤坏死因子有两种，即TNF-α和TNF-β，TNF-α由细菌脂多糖活化的单核巨噬细胞产生，可引起肿瘤组织出血坏死，也称恶病质素。
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恶病质素主要由哪种细胞产生（）。
A.T细胞
B.B细胞
C.中性粒细胞
D.树突状细胞
E.单核巨噬细胞
参考答案：E
解析：肿瘤坏死因子有两种，即TNF-α和TNF-β，TNF-α由细菌脂多糖活化的单核巨噬细胞产生，可引起肿瘤组织出血坏死，也称恶病质素。
Last Sunday I got 36 early in the morning. After a quick 37 , I rode my bike to English Corner (英语角)to practice 38 English. I really like to go there. When I 39 there, it 40 half past eight. There were many people 41 with each other in English. A foreigner（外国人） came up and said “Hello” 42 me. I was excited, 43 that was my ___44 time to talk 45 a foreigner. I never met a foreigner before. At first, I didn’t know what he said. His English was 46 what I learned at school. Later, he slowed 47 . I began to understand （理解）his 48 . He told me the best 49 to learn English was to use it. We talked and talked. I was so hungry, 50 I felt very happy.
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