| Women earn less than men do. For
example, in 1998 the hourly wages of women in the U. S. were 26% less than those
of men. The gap between male and female incomes varies with age. The gap between
the labor incomes of young women and young men varies. It’s also clear that jobs
in which women are concentrated pay less. The larger the number of workers who
are women in ran industry, the lower the average wages. Why do women earn less than men do Can the differences be explained by the fact that women are looked down upon If so, the government has to intervene(干预), to force the employers to pay equal wages to equal jobs. However, there is no agreement among economists about the causes of the gap. One view argues that women, on the average, have chosen low-paying jobs in which workers enjoy the freedom of entering and leaving the lab A. there are more than enough women in the labor force B. women have more freedom in selecting jobs C. women are only provided with low-paid jobs D. women are less experienced than men [单项选择]xdenotes the greatest integer less than or equal to x. Isx=1
(1)x＞1 (2)x＜2 A. 条件(1)充分，但条件(2)不充分． B. 条件(2)充分，但条件(1)不充分． C. 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分． D. 条件(1)充分，条件(2)也充分． E. (E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分． [单项选择]
How many positive prime numbers are less than the integer n ？（） A. 条件（1）充分，但条件（2）不充分. B. 条件（2）充分，但条件（1）不充分. C. 条件（1）和（2）单独都不充分，但条件（1）和条件（2）联合起来充分. D. 条件（1）充分，条件（2）也充分. E. 条件（1）和条件（2）单独都不充分，条件（1）和条件（2）联合起来也不充分. [填空题]Substances with pH values less than 7 are alkaline.
[填空题]Humanity uses a little less than half the water available worldwide.
Yet occurrences of shortages and droughts are causing famine in some but industrial and agricultural by-products are polluting water supplies. (1) _____ Since the world’s population is expecting to double in the next 50 years, (2) _____ many experts think we are on the edge of a widespread water crisis. But that doesn’t have to be the outcome. Water shortages do not have to trouble the world—if we started valuing water more than we (3) _____ have in the past. Just like we began to appreciate petroleum more after (4) _____ the 1970s oil crisis, today we must start looking at water from a fresh economical perspective. We can no longer afford to consider water a (5) _____ virtual free resource of which we can use as much as we like. (6) _____ Instead, for all uses except the domestic demand of the po 我来回答: 提交
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