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【判断题】
肠道免疫系统的B细胞需要T细胞的帮助,才能发生类别转变,生产IgA抗体A.
正确
B.
错误
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皮皮学刷刷变学霸
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【单选题】听力原文：M: Where do your parents work? F: They work in a factory. Where do the woman’s parents work?
A.
They work in two different factories.
B.
They work in the same factory.
C.
Her father works in a factory, her mother works in a school.
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