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单项选择题

婴儿易患革兰阴性细菌感染的主要原因是体内缺少
A、IgA
B、IgG
C、IgM
D、白细胞
E、补体

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相关考题

多项选择题
教学媒体的功能大致有
A．展示事物，形成表象
B．组织教学，管理学生
C．设疑思辨，解决问题
D．呈现过程，解释原理
单项选择题
Read the following excerpts from different genres and  determine the genres according to the language features.
The data was obtained from interviewing 150 year one students about their experiences during their first month at university. The respondents were asked 20 multiple-choice questions divided in to four sections on orientation, course information, socializing and belonging. The questionnaires were administered at the end of September and the results collated the following month
A．academic report
B．grammar textbook
C．science fiction story
D．novel
多项选择题
下列有关风格的设置选项正确的是（ ）
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