According to the passage, the law of diminishing marginal utility______.
A. is explained by income and substitution effects
B. explains why the additional units yield less utility
C. shows that the additional units yield less satisfaction
D. reflects the consumer's desire to get the cheapest buy
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People' different attitudes towards death show that______.
A. people in other countries don't have a great health-care system as Americans do
B. Americans rely too much on their health-care system even to challenge death
C. Americans are optimistic
D. palliative care works wonders in Americans
细胞内蛋白质含量最高的细胞器是()。
A. 高尔复合基体
B. 溶酶体
C. 线粒体
D. 过氧化物酶体
E. 细胞核
技能是一种 ()
A. 智力
B. 能力
C. 才能
D. 熟练化活动方式
下面哪个有关核仁的描述是错误的是()。
A. 核仁的主要功能之一是参与核糖体的生物合成
B. rDNA定位于核仁区内
C. 在细胞内的位置通常是固定的
D. 核仁中的核酸部分主要是rRNA基因及其转录产物
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