题目内容

For some single-child parents, the pressures of devoting time and energy to a second child can seem too overwhelming.Antonyms:

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For other parents, the financial burden of having a second child may be the prime consideration.Synonyms:

Unfortunately, there is no simple answer to the question of whether or not to have a second child.Antonyms:

在Ig类别转化中,能诱导IgE产生的主要细胞因子是( )

A. IL-4
B. TNF
C. IL-2
D. IL-1
E. IL-6

IL-2主要由下列哪种细胞产生( )

A. 单核-巨噬细胞
B. T淋巴细胞
C. B淋巴细胞
D. NK细胞
E. 中性粒细胞