The conclusion is the last part of the essay, which should_______.
A. summarize the main points presented
B. Provide alternative explanation of the findings
C. contain some new facts or ideas
D. provide a definitive statement of the writer's position
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脾脏内最先接触到血液的部位是(单选) 5分40秒( )
A. 脾小体(淋巴小结)
B. 动脉周围淋巴鞘
C. 边缘区
D. 脾窦
E. 脾索
脾的功能是(单选)( )
A. 细胞免疫
B. 体液免疫
C. 滤血
D. 储血
E. 以上均对
脾滤血的主要部位是(单选)( )
A. 脾窦
B. 淋巴小结
C. 脾索
D. 动脉周围淋巴鞘
E. 以上均不是
脾内首先接触抗原引起免疫应答的重要结构是(单选)( )
A. 动脉周围淋巴鞘
B. 淋巴小结
C. 边缘区
D. 脾索
E. 脾窦
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