关于小儿免疫球蛋白,正确的是()
A.IgM发育最快
B.IgG发育最快
C.IgA发育最迟
D.IgA发育最早
E.足月儿的IgG可高于母体
参考答案:A, C, E
—How did you find the leader of the Youth League?
—Well, she talks __________ she herself were an expert on the teenagers.
Aas if B. even though C. even if D. so that
以下哪一项为电子商务的产生和发展提供了技术基础
A.全球区域性贸易的发展
B.电子数据处理系统和管理信息系统
C.Internet和EDI的发展
D.以上都对