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问题 单项选择题 配伍题

DiGeorge综合征属于（）

A.原发性T细胞免疫缺陷

B.原发性B细胞免疫缺陷

C.联合免疫缺陷

D.补体免疫缺陷

E.吞噬细胞免疫缺陷

答案

参考答案：A

选择题

As far as we know, half of Canadian teenagers do not get enough sleep on school nights, _____?[ ]

A. do they

B. don't they

C. don't you

D. isn't it
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名词解释

法是自由的定在
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