搜题请搜索小程序“爱下问搜题”
问题 单项选择题

能直接杀伤肿瘤细胞的是

A．NK细胞
B．B细胞
C．CD8+T细胞
D．CD4+T细胞
E．树突细胞

答案

参考答案：C

解析：细胞毒性T细胞(CD8+CTL/TC)可通过与肿瘤细胞的接触而发挥直接杀伤作用，还可通过分泌细胞因子显现杀瘤效应。

综合

如图是“某城市郊区农业布局示意图”，读图回答：

（1）图中的农业布局：①乳肉家禽饲养带②水果园艺业③粮食产区④林牧业区，这

种布局是否合理？                    

（2）简述乳肉家禽饲养带布局的理由。

（3）由T1到T2后，由于                                            原因，导致农业经营还将扩大，这说明农业生产受                   影响较大。
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C．Club Francais.D．Global Language Learning Center.
小题2:The underlined word “picturesque” is closest in meaning to _____.
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小题3:Which of the following is true of Club Francais?
A．Adults Normal Course lasts about eight weeks.
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