| Working at nonstandard times--evenings,
nights, or weekends—is taking its toll on American families.
One-fifth of all employed Americans work variable or rotating shifts, and one-
third work weekends, according to Harriet B．Presser, sociology professor at the
University of Maryland. The result is stress on familial relationships, which is
likely to continue in coming decades. The consequences of working irregular hours vary according to gender, economic level, and whether or not children are involved. Single mothers are more likely to work nights and weekends than married mothers. Women in clerical, sales, or other low-paying jobs participate disproportionately in working late and graveya A. Stress on familial relationships. B. Rotating shifts. C. Evenings, nights, or weekends. D. Its consequences. [单项选择]According to the passage, all of the following factors have been associated as either a cause or effect of the emergence of segregated black neighborhoods EXCEPT
A. The failure of the educational system to help improve blacks’ economic status B. Political apathy on the of the authorities to solve the problem of segregation C. A preference on the part of blacks concerning where they choose to live D. Rising rate of unemployment among the black community E. Racial conflict between the black community and other communities [单项选择]According to the passage, all of the following are true concerning the process of negative feedback EXCEPT
A. By diminishing errors, negative feedback allows systems to correct themselves. B. Negative feedback always arises out of a system where several factors are interacting. C. Negative feedback sometimes causes a disturbed system to over-correct, resulting in an impressed change opposite to the original disturbance. D. Negative feedback is less important, on the whole, than departure from equilibrium. E. Ideally, negative feedback gradually diminishes, allowing a system to find its desired course. 我来回答: 提交
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