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问题 单项选择题 A1型题

下列哪项不是影响化学物质在土壤中迁移转化的因素（）

A.土壤的微生物含量

B.土壤的pH

C.土壤的颗粒大小

D.土壤中的无机物的含量

E.土壤中的氧化还原状态

答案

参考答案：D

单项选择题

Passage twoEducating girls quite possibly yields a higher rate of return than any other investment available in the developing world .women’s education may be unusual territory for economists ,but enhancing women’s contribution to development is actually as much an economic as a social issue .and economics ,with its emphasis on incentives ,provides guideposts that point to an explanation for why so many girls are deprived of an education Parents in low-income countries fail to invest in their daughters because they do not expert them to make an economic contribution to he family :girls grow up only to marry into somebody else’s family and bear children .Girls are thus seen as less valuable than boys and kept at home to do housework while their brothers are sent to school-the prophecy becomes self-fulfilling ,trapping women in a vicious circle of neglect. An educated mother ,on the other hand ,has greater earning abilities outside the home and faces an entirely different set of choices. She is likely to have fewer but healthier children and can insist on the development of all her children ,ensuring that her daughters are given a fair chance .The education of her daughters then makes it much more likely that the next generation of girls ,as well as of boys ,will be education and healthy . The vicious circle is thus transformed into a virtuous circle. Few will dispute that education women has great social benefits.But it has enormous economic advantages as well .Most obviously ,there is the direct effect of education on the wages of female workers.Wages rise by 10 to 20 percent for each additional year of schooling. Such big returns are impressive by the standard of other available investments ,but they are just the beginning .Education women also has a significant impact on health practices,including family planning.

The passage mainly discusses ( )

A．unequal treatment of boys and girls in developing countries

B．the potential earning power of well –educated women

C．the major contributions of educated women to society

D． the economic and social benefits of educating women

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单项选择题

用电设备使用前，必须对工作人员进行培训；使用时，工作人员必须遵守说明书上的（），并注意安全作业。

A.安全要求

B.操作要求

C.检查内容

D.维护方法
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