由中间纤维结合蛋白(intermediate filament-associated protein，IFAPs)将中间纤维相互交联成束状的结构称作张力丝。
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The government with finite resources had better______.
A. balance its budget for research into cures and that into therapies that can help people live healthier and happier lives
B. stop paying for medical care that sustains life beyond age 83 so that younger and healthier people can realize their potential
C. make it a rule that people in industry, academia and government who are over 55 should retire
D. spend less on health and more on housing, defense and education
The growth of home schooling is due to several factors EXCEPT______.
A. tutors
B. parents
C. course materials
D. tutoring systems
在证明细胞分化是基因选择性表达结果的实验中，分别用成红细胞中珠蛋白基因、输卵管细胞的卵清蛋白基因以及胰岛细胞的胰岛素基因分别作探针进行杂交。需要运用到下列哪种杂交方法？()
A. Southem杂交
B. Northem杂交
C. Western杂交
D. Southern杂交和Northern杂交
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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