王亮在超市看到一种电池外壳的纸层包装印有右图的文字，请根据要求回答问题．
（1）该电池的种类是______（填序号）．
①干电池 ②蓄电池 ③燃料电池
（2）该电池含有的金属元素中毒性最大的是______（写元素符号）．
（3）该电池的使用和性能，说法正确的是______
A．该电池可应用于闹钟、收音机、照相机等
B．该电池可充电后反复使用
C．该电池使用后不能投入火中，应埋入地下以防污染环境．
（1）锌锰干电池为一次电池，属于干电池，故答案为：①；
（2）锌锰干电池中含有汞，具有较强的毒性，故答案为：Hg；
（3）锌锰干电池中含有含有重金属离子，不能随意丢弃，更不能掩埋，属于一次电池，不能反复使用，故答案为：A．
| Modern industrial society grants little status to old people. In fact, such a society has a system of built-in obsolescence. There is no formal system for continuing our education throughout our life in order to keep up with rapidly changing knowledge. When our education and job skills have grown obsolete, we are treated exactly like those who have never gained an education or job skills and are not encouraged or given the opportunity to begin anew. As a society becomes more highly developed, the overall status of older people diminishes. Improved health technology creates a large pool of old people, who compete for jobs with the young. However, economic technology lowers the demand for workers and creates new jobs for which the skills of the aged are obsolete, forcing older people into retirement. At the same time, young people are being educated in the new technology and are keeping pace with rapid changes in knowledge. Finally, urbanization creates age-segregated neighborhoods. Because the old live on fixed incomes, they must often live in inferior housing. All these factors -- retirement, obsolete knowledge and skills, inferior standards of living -- lower the status of the aged in society. A century ago, when one could expect to live only to 50 or so, the life span more or less coincided with the occupation and family cycle. But today the average life span allows for fifteen to twenty years of life after these cycles. It appears that our life span is outpacing our usefulness in society. |
The high development of economic technology______.
A．makes job skills out of fashion
B．lowers the demand for workers
C．forces old people into retirement
D．creates new jobs for older people