问题
单项选择题
某一细胞因子在淋巴细胞识别Ag时作为第二信使，使T细胞活化成为效应细胞参与免疫应答，该细胞因子是（）
A.IL-1
B.IL-2
C.IL-4
D.IL-10
E.IL-12
答案
参考答案：B
解析：IL-2又名T细胞生长因子，由活化的T细胞产生，其功能为促进淋巴细胞增生与活化。
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某一细胞因子在淋巴细胞识别Ag时作为第二信使，使T细胞活化成为效应细胞参与免疫应答，该细胞因子是（）
A.IL-1
B.IL-2
C.IL-4
D.IL-10
E.IL-12
参考答案：B
解析：IL-2又名T细胞生长因子，由活化的T细胞产生，其功能为促进淋巴细胞增生与活化。
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| Leonardo da Vinci was a great artist. He lived in 1 in the fifteenth and sixteenth centuries. He painted some of 2 pictures in the world. Mona Lisa is a good example of his works. He 3 painting Mona Lisa in 1503. Da Vinci loved science and 4 . He used darkness and light in a clever way in the painting. And a person can 5 see that there is a lot of geometry (几何学) in Mona Lisa. The face of Mona Lisa is 6 many circles and round shapes like balls. Even her 7 can be seen as a small part of a large circle. The woman in the painting is 8 on a balcony ( 阳台)? and mountains can be seen behind her. Da Vinci loved to study rocks and mountains, 9 we can see these in his other paintings. The woman is sitting with her knees to the side. He hands are held together 10 her. This way of sitting is now used by many artists when they are painting a picture of a man or woman. | ||||
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