题目内容

Substances produced by immune cells that counteract microorganisms and other foreign materials are called:

A. antibodies
B. antigens
C. anticoagulants
D. Rh factors

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A deficiency of hemoglobin results in the disorder called:

A. hypertension
B. chromatosis
C. anemia
D. hemophilia

A neoplastic overgrowth of white blood cells is called:

A. anemia
B. leukemia
C. fibrosis
D. cystitis

人们常说“多多益善”,从经济学角度来说，这是指随着所消费的商品数量增多（）。

A. 总效用递增
B. 边际效用递增
C. 总效用递减
D. 边际效用递减

有关消费者行为分析存在基数效用论和序数效用论之分，二者最主要的差异性在于是否假定（）。

A. 需求规律
B. 效用取决于商品的价格
C. 边际效用递减
D. 总效用递增