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问题 单项选择题

机体受外源抗原刺激后，发生免疫应答的部位是

A．骨髓

B．淋巴结

C．胸腺

D．腔上囊

E．外周血

答案

参考答案：B

解析：机体受外源抗原刺激后，发生免疫应答的部位是淋巴结。

改错题

Knowing how to do in case of fire is important. If a fire break out, what would you do? First, you should warn everyone in the building about the danger. Don’t panic or start shouting. Be calmly and act quickly. Second, you and all the others should be get out of the building. Don’t stop take anything with you. Once you are out of the building, stay out. Do not go back for some reason. Finally, when you are out of the building, calling the fire police. Don’t try to put off the fire yourself. That can be dangerous if you do.

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单项选择题

对于只有两种取值的字段，最好使用哪种数据类型( )。

A．日期型

B．字符型

C．数值型

D．逻辑型
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