问题
单项选择题 A1/A2型题
免疫球蛋白的型及亚型分类依据是 （）
A.VH抗原性的不同
B.CL抗原性的不同
C.CH抗原性的不同
D.VL抗原性的不同
E.CV抗原性的不同
答案
参考答案：B
解析：根据Ig轻链C区氨基酸组成和排列的不同，可将L链分为κ和λ两型。在A型轻链C区内氨基酸组成又存在微小差异，由此将A链分为4个亚型。
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免疫球蛋白的型及亚型分类依据是 （）
A.VH抗原性的不同
B.CL抗原性的不同
C.CH抗原性的不同
D.VL抗原性的不同
E.CV抗原性的不同
参考答案：B
解析：根据Ig轻链C区氨基酸组成和排列的不同，可将L链分为κ和λ两型。在A型轻链C区内氨基酸组成又存在微小差异，由此将A链分为4个亚型。
China is the home of tea, 36 has more than 4,000 years of history. People in China drink tea daily. 37 the three major drinks ----tea, coffee and cocoa, tea is drunk by 38 people in the world. Tea from China, along 39 silk and porcelain, began to be known by the world over a thousand years ago and has been an important Chinese export 40 . Tea leaves 41 mainly in the area south of the Yangtze River, in the provinces of Zhejiang, Jiangxi and Fujian, because of the mild 42 and rich soil there. Longjing, Wulong, Pu’er and Tieguanyin are all 43 kinds of tea. Over the past centuries, Chinese people 44 their unique tea culture, which includes tea planting, tea-leaf picking, tea making, tea drinking and so on. Tea is 45 a popular topic which is often mentioned in dances, songs, poems and novels.
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