下列哪种是人工主动免疫A．接种抗毒素B．接种类毒素C．通过胎盘_爱下问搜题

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问题单项选择题

下列哪种是人工主动免疫

A．接种抗毒素
B．接种类毒素
C．通过胎盘和初乳
D．传染病后
E．隐性感染

答案

参考答案：B

阅读理解

阅读理解。根据题目要求选择合适选项。

The Student Union (学生会) plans to plant trees on the West Hill Farm next Friday afternoon. They'll meet
at the school gate at 7:00 am. They need to take spades (铁锹), barrels (水桶), saplings (树苗), some ropes (绳子). They do so to help protect the environment.
Now help finish a poster to let everyone know about it.

A
( )1. Activity
( )2. Aims(目的)
( )3. Date
( )4. Place to meet
( )5. Things to take

B
A. School gate
B. Ropes
C. Spades
D. Protect the environment
E. Next Friday
F. Planting trees
G. Saplings
H. Barrels

填空题

梅尼埃病眩晕发作时可伴有________、呕吐、_________、出冷汗等植物神经反射症状。